International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.5 http://ecoevopublisher.com/index.php/ijmec © 2024 EcoEvoPublisher, registered at the publishing platform that is operated by Sophia Publishing Group, founded in British Columbia of Canada. All Rights Reserved. -
International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.5 http://ecoevopublisher.com/index.php/ijmec © 2024 EcoEvoPublisher, registered at the publishing platform that is operated by Sophia Publishing Group, founded in British Columbia of Canada. All Rights Reserved. EcoEvoPublisher is an international Open Access publisher specializing in molecular ecology and conservation research registered at the publishing platform that is operated by Sophia Publishing Group (SPG), founded in British Columbia of Canada. Publisher EcoEvo Publisher Edited by Editorial Team of International Journal of Molecular Ecology and Conservation Email: edit@ijmec.ecoevopublisher.com Website: http://ecoevopublisher.com/index.php/ijmec Address: 11388 Stevenston Hwy, PO Box 96016, Richmond, V7A 5J5, British Columbia Canada International Journal of Molecular Ecology and Conservation (ISSN 1927-663X) is an open access, peer reviewed journal published online by EcoEvoPublisher. The journal is considering all the latest and outstanding research articles, letters and reviews in all aspects of molecular ecology and conservation, containing the contents of the ranges from the applied to the theoretical in molecular ecology and nature conservation, the policy and management with comprehensive and applicable information; the ecological bases for the conservation of ecosystems, species, genetic diversity, the restoration of ecosystems and habitats; as well as the expands the field of ecology and conservation work. All the articles published in International Journal of Molecular Ecology and Conservation are Open Access, and are distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. EcoEvoPublisher uses CrossCheck service to identify academic plagiarism through the world’s leading plagiarism prevention tool, iParadigms, and to protect the original authors’ copyrights.
International Journal of Molecular Ecology and Conservation (online), 2024, Vol. 14, No.5 ISSN 1927-663X https://ecoevopublisher.com/index.php/ijmec © 2024 EcoEvoPublisher, registered at the publishing platform that is operated by Sophia Publishing Group, founded in British Columbia of Canada. All Rights Reserved. Latest Content Aphid-Plant Interactions: Evolutionary and Ecological Perspectives Xiaoqing Tang International Journal of Molecular Ecology and Conservation, 2024, Vol. 14, No. 5, 196-207 Genomic Insights into the Adaptation of Crustaceans to Climate Change Xiaojie Liu, Kai Chen, Jia Xuan International Journal of Molecular Ecology and Conservation, 2024, Vol. 14, No. 5, 208-217 Proximate and Ultimate Causes of Species Endangerment and Population Decline Jing He, Jun Li International Journal of Molecular Ecology and Conservation, 2024, Vol. 14, No. 5, 218-224 Environmental Genomics of Gammarus: Responses to Habitat Changes Fangqi Xu International Journal of Molecular Ecology and Conservation, 2024, Vol. 14, No. 5, 225-233 The Impact of Urbanization on Bird Species Adaptive Traits and Survival Jia Chen, Yanlin Wang International Journal of Molecular Ecology and Conservation, 2024, Vol. 14, No. 5, 234-240
International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.5, 196-207 http://ecoevopublisher.com/index.php/ijmec 196 Research Insight Open Access Aphid-Plant Interactions: Evolutionary and Ecological Perspectives Xiaoqing Tang Hainan Institute of Biotechnology, Haikou, 570206, Hainan, China Corresponding author: xiaoqing.tang@hitar.org International Journal of Molecular Ecology and Conservation, 2024, Vol.14, No.5 doi: 10.5376/ijmec.2024.14.0021 Received: 15 Jul., 2024 Accepted: 31 Aug., 2024 Published: 07 Sep., 2024 Copyright © 2024 Tang, This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Preferred citation for this article: Tang X.Q., 2024, Aphid-Plant Interactions: Evolutionary And Ecological Perspectives, International Journal of Molecular Ecology and Conservation, 14(5): 196-207 (doi: 10.5376/ijmec.2024.14.0021) Abstract This study analyzes the evolutionary and ecological mechanisms of aphid-plant interactions, exploring plant physical, chemical, and inducible defense strategies, as well as aphid physiological, behavioral, and symbiotic adaptations to host plant defenses. The findings indicate that plants resist aphid infestation through mechanisms such as trichomes, cuticle thickening, and secondary metabolites, while aphids have evolved salivary effectors, detoxification enzyme systems, and behavioral adaptations to overcome plant defenses. This study provides a scientific basis for understanding the molecular mechanisms, ecological impacts, and management strategies of aphid-plant interactions. With advancements in genomics and CRISPR technology, future research will further elucidate the molecular basis of aphid-plant coevolution, offering new insights for the development of aphid-resistant crops and sustainable pest management. KeywordsAphid-plant interactions; Plant defense mechanisms; Aphid adaptation; Virus transmission; Integrated pest management 1 Introduction Aphid-plant interactions represent a complex and dynamic system that has significant implications for both ecological and agricultural landscapes. Aphids, as major agricultural pests, have developed sophisticated mechanisms to exploit their host plants, which include overcoming plant defenses and manipulating plant physiology to their advantage (Guerrieri and Digilio, 2008; Sadek et al., 2013). These interactions are not only crucial for understanding pest management but also provide insights into the evolutionary processes that shape plant-herbivore relationships. The ability of aphids to adapt to various host plants through enzymatic adaptations and the sequestration of plant metabolites highlights the intricate co-evolutionary arms race between these insects and their host plants (Züst and Agrawal, 2016). The importance of aphid-plant interactions extends beyond direct plant damage. Aphids influence the broader ecological community by interacting with other organisms such as predators, parasitoids, and even other herbivores (Goggin, 2007; Evans, 2008). These interactions can lead to indirect effects on plant fitness and community dynamics, as plants may attract natural enemies of aphids through the release of volatile compounds, thereby enhancing indirect plant resistance. Furthermore, the genetic diversity within plant populations can mediate aphid distribution and performance, indicating that plant genetic variation plays a critical role in shaping these interactions (Zytynska et al., 2013). This study attempts to comprehensively analyze the current research results on aphid plant interactions from the dual perspectives of evolution and ecology. By exploring the molecular mechanisms, ecological outcomes, and evolutionary processes involved, this study will comprehensively reveal the formation mechanism of this interaction and its application value in pest control strategies. It is expected to provide useful insights for sustainable agricultural practices and effectively alleviate aphid infestation. 2 Aphids as Key Herbivores 2.1 Taxonomy and diversity of aphids Aphids belong to the superfamily Aphidoidea and are characterized by their small size, soft bodies, and diverse morphologies. This group of insects exhibits a wide range of diversity, with over 4 000 species described worldwide. Aphids are found in various habitats, from temperate to tropical regions, and they have adapted to feed
International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.5, 196-207 http://ecoevopublisher.com/index.php/ijmec 197 on a wide array of plant species, including many economically important crops (Guerrieri and Digilio, 2008). The diversity of aphids is reflected in their complex life cycles and reproductive strategies, which contribute to their success as herbivores. The taxonomy of aphids is continually being refined as new molecular techniques provide insights into their evolutionary relationships. This diversity is not only taxonomic but also ecological, as different aphid species have specialized feeding habits and host plant preferences. Understanding the taxonomy and diversity of aphids is essential for developing effective management strategies, as different species may require tailored approaches to control their populations and mitigate their impact on agriculture (Powell et al., 2006). 2.2 Life cycle and reproductive strategies Aphids exhibit a range of reproductive strategies that enhance their adaptability and survival. They are known for their ability to reproduce both sexually and asexually, with many species capable of parthenogenesis, where females produce offspring without mating. This reproductive flexibility allows aphids to rapidly colonize new environments and exploit available resources efficiently (Guerrieri and Digilio, 2008). The alternation between sexual and asexual reproduction is often influenced by environmental conditions, such as temperature and host plant availability, which can trigger the production of winged or wingless morphs to facilitate dispersal and colonization. The life cycle of aphids is complex, involving multiple generations per year. During favorable conditions, aphids can produce several generations of offspring in a single growing season, leading to exponential population growth. This rapid reproduction is a key factor in their success as herbivores and their ability to cause significant damage to crops. Understanding the life cycle and reproductive strategies of aphids is crucial for predicting their population dynamics and developing effective pest management strategies (Xi et al., 2024). 2.3 Feeding Mechanisms and Phloem-Sap Extraction Aphids have evolved specialized feeding mechanisms that allow them to extract phloem sap from their host plants efficiently. Their mouthparts, known as stylets, are long and flexible, enabling them to penetrate plant tissues and reach the phloem vessels. This feeding strategy is highly efficient, allowing aphids to access a continuous supply of nutrients while minimizing damage to the plant (Giordanengo et al., 2010). The process of phloem-sap extraction involves overcoming plant defenses, such as sieve tube occlusion and the activation of defense signaling pathways (Züst and Agrawal, 2016). Aphids secrete saliva that contains enzymes and proteins to manipulate plant responses, facilitating successful feeding and reproduction. This manipulation can alter plant metabolism and resource allocation, often leading to changes in plant growth and development. The stealthy nature of aphid feeding, combined with their ability to bypass plant defenses, makes them particularly challenging to manage in agricultural settings. Understanding the feeding mechanisms of aphids is essential for developing strategies to enhance plant resistance and reduce the impact of aphid infestations (Voelckel et al., 2004; Sadras et al., 2021). 3 Plant Defense Mechanisms Against Aphids 3.1 Physical barriers: trichomes and cuticle thickness Plants have developed various physical barriers to protect themselves from aphid infestations. Trichomes, which are hair-like structures on the plant surface, play a significant role in deterring aphids by creating a physical barrier that makes it difficult for these pests to reach the plant's surface. The presence of dense trichomes can impede aphid movement and feeding, thereby reducing the likelihood of infestation (Nalam et al., 2019). Additionally, the thickness of the plant cuticle, which is the outermost layer of the plant, serves as another line of defense. A thicker cuticle can prevent aphids from penetrating the plant tissue with their stylets, which are specialized mouthparts used to extract phloem sap (Züst and Agrawal, 2016). These physical barriers are crucial in the initial stages of aphid attack, providing the plant with time to activate other defense mechanisms.
International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.5, 196-207 http://ecoevopublisher.com/index.php/ijmec 198 Moreover, the effectiveness of these physical barriers can vary among plant species and even among different cultivars of the same species. This variation is often a result of evolutionary pressures that have shaped the development of these structures in response to aphid pressure (Züst and Agrawal, 2016). Understanding the genetic and environmental factors that influence trichome density and cuticle thickness can provide insights into breeding programs aimed at enhancing plant resistance to aphids. 3.2 Chemical defenses: secondary metabolites and volatile organic compounds Chemical defenses are a critical component of plant resistance against aphids, involving the production of secondary metabolites and volatile organic compounds (VOCs). Secondary metabolites, such as alkaloids, glucosinolates, and phenolics, are toxic to aphids and can deter feeding or reduce aphid survival and reproduction. These compounds can be constitutively present in the plant or induced upon aphid attack, providing a dynamic defense strategy (Divekar et al., 2022). The biosynthesis of these metabolites is often regulated by complex signaling pathways involving phytohormones, which are activated in response to herbivore damage. Volatile organic compounds play a dual role in plant defense. They can directly deter aphids by making the plant less palatable or toxic, and they can also serve as indirect defenses by attracting natural enemies of aphids, such as parasitic wasps (Karalija et al., 2023). The release of specific VOCs can signal the presence of aphids to these natural enemies, thereby enhancing the plant's defense through a tritrophic interaction. The specificity of VOCs to particular herbivores allows plants to tailor their chemical defenses to the specific threats they face, making this an efficient and targeted defense strategy. 3.3 Induced vs. Constitutive Defense Strategies Plants employ both constitutive and induced defense strategies to combat aphid infestations. Constitutive defenses are always present in the plant and include both physical barriers and chemical compounds that provide a constant level of protection against aphids (Gatehouse, 2002). These defenses are particularly important for deterring initial aphid colonization and can vary significantly between plant species and even among different genotypes within a species. Induced defenses, on the other hand, are activated in response to aphid attack. These defenses can involve the upregulation of secondary metabolite production and the release of VOCs, which are not present or are present at lower levels in the absence of herbivory (Kaplan et al., 2008; Kant et al., 2015). Induced defenses allow plants to allocate resources efficiently, activating costly defense mechanisms only when needed. This strategy can be advantageous in environments where aphid pressure is variable, as it reduces the metabolic cost associated with maintaining high levels of defense compounds at all times. 4 Aphid Adaptations to Plant Defenses 4.1 Evolution of salivary effectors and detoxification enzymes Aphids have developed a sophisticated arsenal of salivary effectors that play a crucial role in overcoming plant defenses. These effectors are proteins secreted into the host plant during feeding, which manipulate plant physiological responses to facilitate aphid colonization and feeding. The evolution of these effectors is driven by the interactions with host plants, leading to lineage-specific expansions and rapid evolution of gene families associated with these proteins (Boulain et al., 2018). For instance, in the pea aphid, Acyrthosiphon pisum, a comprehensive analysis identified 3 603 candidate effector genes, with a significant portion showing rapid evolution and positive selection, indicating their role in host plant specialization and adaptation (Carolan et al., 2011). The functional diversity of these effectors is evident in their ability to suppress plant defenses. For example, the salivary effector Sm9723 from the grain aphid Sitobion miscanthi suppresses plant defense responses, which is essential for aphid survival on wheat (Zhang et al., 2022). Similarly, the salivary protein Mp55 from Myzus persicae increases aphid reproduction by reducing the accumulation of defense-related compounds in host plants (Elzinga et al., 2014). These findings underscore the critical role of salivary effectors in aphid adaptability and their evolutionary significance in plant-aphid interactions.
International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.5, 196-207 http://ecoevopublisher.com/index.php/ijmec 199 4.2 Behavioral adaptations: host preference and avoidance strategies Aphids exhibit behavioral adaptations that enhance their ability to exploit host plants effectively. Host preference and avoidance strategies are key behavioral traits that have evolved to optimize feeding efficiency and minimize exposure to plant defenses. Aphids can select host plants that are more susceptible to infestation, thereby avoiding plants with strong defense mechanisms. This selective behavior is often mediated by the detection of specific plant cues and the ability to modulate feeding behavior in response to plant defense signals (Züst and Agrawal, 2016). Moreover, aphids can alter their feeding strategies to avoid triggering plant defenses. For instance, the secretion of specific salivary proteins can modulate plant defense responses, allowing aphids to feed more effectively. The salivary effector Sg2204 fromSchizaphis graminum, for example, suppresses wheat defense mechanisms, thereby enhancing aphid feeding and reproduction (Zhang et al., 2022). These behavioral adaptations, combined with the biochemical arsenal of salivary effectors, enable aphids to exploit a wide range of host plants and adapt to varying environmental conditions. 4.3 Symbiotic associations and their role in aphid adaptability Symbiotic associations play a pivotal role in the adaptability of aphids to plant defenses. Aphids often harbor facultative symbionts that provide various benefits, including enhanced tolerance to environmental stresses and improved colonization of host plants. For instance, the symbiont Serratia symbiotica in Acyrthosiphon pisumhas been shown to manipulate aphid gene expression in salivary glands, leading to the suppression of plant defense responses and facilitating longer feeding durations on host plants (Wang et al., 2020). These symbiotic relationships are integral to aphid adaptability, as they can enhance the aphid's ability to overcome plant defenses and exploit new host plants. The presence of symbionts can also influence the expression of salivary effectors, further enhancing the aphid's ability to modulate plant defenses. This symbiotic interaction highlights the complex interplay between aphids, their symbionts, and host plants, which is crucial for understanding the evolutionary dynamics of aphid-plant interactions. 5 Ecological Consequences of Aphid-Plant Interactions 5.1 Impacts on plant growth and yield reduction Aphids are notorious for their detrimental effects on plant growth and yield, primarily due to their sap-sucking behavior, which deprives plants of essential nutrients. This feeding activity can lead to significant reductions in plant vigor and productivity, as aphids drain the phloem sap, which is crucial for plant growth and development (Goggin, 2007). The impact of aphids on plant yield is further exacerbated by their ability to reproduce rapidly, leading to large populations that can cause extensive damage in a short period. Additionally, aphid infestations can trigger plant defense mechanisms, which, while protective, can also divert resources away from growth and reproduction, further impacting yield (Jaouannet et al., 2014). Moreover, aphids can indirectly affect plant growth by acting as vectors for plant viruses, which can cause additional stress and damage to the host plants. The transmission of these viruses can lead to symptoms such as stunted growth, leaf curling, and chlorosis, all of which contribute to reduced plant productivity (Jayasinghe et al., 2021). The dual impact of direct feeding damage and virus transmission makes aphids a significant threat to agricultural productivity and necessitates effective management strategies to mitigate their effects. 5.2 Effects on plant community structure and biodiversity Aphid-plant interactions can significantly influence plant community structure and biodiversity. By selectively feeding on certain plant species, aphids can alter competitive dynamics within plant communities, potentially leading to shifts in species composition. This selective pressure can result in the dominance of aphid-resistant plant species, thereby reducing overall biodiversity (Kamphuis et al., 2013). Furthermore, the presence of aphids can affect the interactions between plants and other organisms, such as pollinators and herbivores, which can further influence community dynamics (Joffrey et al., 2017).
International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.5, 196-207 http://ecoevopublisher.com/index.php/ijmec 200 The impact of aphids on plant community structure is also mediated through their role as vectors of plant viruses. Virus-infected plants may exhibit altered growth patterns and reduced competitive ability, which can lead to changes in community composition. Additionally, the spread of plant viruses by aphids can lead to widespread disease outbreaks, which can have cascading effects on plant communities and associated ecosystems. These interactions highlight the complex ecological roles that aphids play in shaping plant communities and underscore the importance of understanding these dynamics for biodiversity conservation (Enders and Hefley, 2023). 5.3 Aphid-Vector Relationships: Transmission of Plant Viruses Aphids are key vectors in the transmission of plant viruses, which they spread through their feeding activities. The transmission process is influenced by the biology and morphology of aphids, which have evolved to efficiently acquire and transmit viruses between host plants. Aphids can transmit viruses in different modes, including persistent and non-persistent transmission, each with distinct ecological and epidemiological implications. The ability of aphids to transmit viruses is a major factor in the spread of plant diseases, which can lead to significant agricultural losses. The relationship between aphids and plant viruses is not merely mechanical; it involves complex interactions that can influence the efficiency of virus transmission. For instance, some plant viruses can manipulate the host plant's physiology to enhance aphid performance and virus spread (Krieger et al., 2023). Additionally, environmental factors such as abiotic stresses can modulate these interactions, affecting virus transmission dynamics (Van Munster, 2020). Understanding the intricacies of aphid-vector relationships is crucial for developing effective strategies to control the spread of plant viruses and mitigate their impact on agriculture. 6 Coevolutionary Dynamics Between Aphids and Host Plants 6.1 Genetic basis of plant resistance and aphid counter-adaptations The genetic basis of plant resistance to aphids involves complex interactions between plant defense mechanisms and aphid counter-adaptations. Plants have evolved various strategies to recognize and respond to aphid attacks, including the activation of defense genes that produce physical and chemical barriers (Guerrieri and Digilio, 2008). These defenses are often mediated by specific plant receptors that detect aphid salivary proteins, triggering phytohormonal signaling pathways and the production of secondary metabolites (Züst and Agrawal, 2016). However, aphids have developed counter-adaptations to overcome these defenses. For instance, some aphid populations have evolved virulence by downregulating effector genes, which helps them evade plant defenses (Yates-Stewart et al., 2020). Additionally, the genetic diversity within aphid populations, such as the presence of different genotypes, can influence their ability to adapt to resistant plant varieties. The coevolutionary dynamics between aphids and plants are further complicated by the genetic interactions within plant species. Studies have shown that genetic variation in host plants can lead to unique evolutionary trajectories in aphid populations. For example, aphids transplanted onto genetically distinct plant variants exhibit different reproductive success, indicating local adaptation and rapid evolution in response to plant genetic diversity (Wooley et al., 2020). This genetic interplay highlights the ongoing arms race between aphids and their host plants, where both parties continuously adapt to each other's evolutionary changes. 6.2 Evolutionary arms race: case studies of rapid adaptation The evolutionary arms race between aphids and host plants is characterized by rapid adaptation on both sides. A notable example is the soybean aphid (Aphis glycines), which has quickly developed virulence against resistant soybean cultivars in North America. This rapid adaptation is facilitated by the induction of susceptibility in plants, allowing both virulent and avirulent aphid populations to coexist and thrive (O’Neal et al., 2018). Such dynamics illustrate how aphids can swiftly overcome plant resistance, posing challenges for sustainable pest management. Another case study involves the cottonwood aphid (Chaitophorus populicola), which demonstrates local adaptation across different genetic variants of its host plant, Populus angustifolia. Experiments have shown that aphids transplanted onto their native plant genotypes produce significantly more offspring than those on foreign genotypes, indicating rapid evolutionary responses to host plant genetic variation (Wooley et al., 2020). These
International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.5, 196-207 http://ecoevopublisher.com/index.php/ijmec 201 examples underscore the speed and complexity of the coevolutionary processes between aphids and plants, driven by genetic and ecological factors. 6.3 Impact of environmental changes on coevolutionary processes Environmental changes, such as climate change and human-induced perturbations, significantly impact the coevolutionary dynamics between aphids and host plants. These changes can alter the genetic structure of both aphid and plant populations, influencing their interactions and evolutionary trajectories. For instance, the introduction of invasive species and shifts in climate can lead to new selective pressures, prompting rapid evolutionary responses in aphid populations. Such changes can cascade through ecosystems, affecting entire communities and their ecological interactions. Moreover, the role of the soil microbiome in mediating plant-aphid interactions highlights another layer of complexity in coevolutionary processes. Soil microbes can influence plant growth and aphid population dynamics, thereby affecting the competitive interactions among different aphid genotypes. This microbial mediation can lead to rapid evolutionary changes in aphid populations, demonstrating the interconnectedness of environmental factors and coevolutionary dynamics (Xi et al., 2024). Understanding these interactions is crucial for predicting and managing the impacts of environmental changes on aphid-plant coevolution. 7 Case Analysis: The Interaction Between Myzus persicae (Green Peach Aphid) and Cruciferous Crops 7.1 Host range and economic significance Myzus persicae, commonly known as the green peach aphid, is a highly adaptable pest with a broad host range, affecting over 400 plant species, including many economically significant crops such as cruciferous vegetables. This aphid is notorious for its ability to thrive on a variety of host plants, which contributes to its status as a major agricultural pest. The economic impact of M. persicae is substantial, as it not only causes direct damage through feeding but also acts as a vector for plant viruses, further exacerbating crop losses (Byrd et al., 2023). The adaptability of M. persicae to different host plants is facilitated by its genetic variability, which allows it to exploit diverse agro-ecosystems effectively. This adaptability poses significant challenges for pest management, as it can lead to rapid population outbreaks in monoculture systems, particularly in fields with low genetic diversity. The economic significance of M. persicae is further highlighted by its ability to enhance its performance on pre-infested plants. For instance, studies have shown that M. persicae can increase its weight and population growth on previously infested Chinese cabbage, suggesting that the aphid can manipulate host plant defenses to its advantage (Cao et al., 2016). This ability to suppress plant resistance and improve nutritional quality of the host plant underscores the need for integrated pest management strategies that consider both the direct and indirect impacts of aphid infestations on crop yield and quality (Cao et al., 2016). 7.2 Molecular mechanisms of plant resistance The interaction betweenM. persicae and its host plants involves complex molecular mechanisms that govern plant resistance. Research has shown that the feeding of M. persicae on plants like Arabidopsis thaliana triggers localized defense responses, which are mediated by specific salivary components of the aphid (De Vos and Jander, 2009). These components induce the expression of a unique set of genes in the host plant, which are largely independent of the traditional defense signaling pathways involving salicylic acid and jasmonate. This suggests that M. persicae has evolved mechanisms to circumvent common plant defense strategies, allowing it to maintain its feeding activity with minimal disruption. Moreover, the interaction between M. persicae and its host plants is influenced by the presence of endophytic fungal entomopathogens, which can enhance plant resistance to aphid infestation. For example, the colonization of plants by fungi such as Beauveria bassiana and Metarhizium brunneum has been shown to reduce aphid populations and delay their development, indicating a potential role for these fungi in integrated pest management (Jaber and Araj, 2018). These findings highlight the importance of understanding the molecular interactions
International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.5, 196-207 http://ecoevopublisher.com/index.php/ijmec 202 between aphids, their host plants, and associated microorganisms to develop effective strategies for managing aphid populations. 7.3 Evolutionary responses of Myzus persicae to pesticide and plant defenses Myzus persicae has demonstrated a remarkable capacity to evolve resistance to various insecticides, posing a significant challenge to pest control efforts. Over the years, M. persicae has developed resistance to multiple classes of insecticides, including neonicotinoids and sulfoxaflor, through various biochemical and molecular mechanisms (Ward et al., 2023). For instance, the enhanced expression of cytochrome P450 enzymes and specific genetic mutations have been identified as key factors contributing to neonicotinoid resistance in field populations of M. persicae (Sial et al., 2022). These adaptations not only allow the aphid to survive chemical treatments but also highlight the rapid evolutionary potential of this pest in response to selective pressures. In addition to chemical resistance, M. persicae has also evolved strategies to overcome plant defenses. For example, studies have found that after green peach aphid (GPA) feeding on Cuscuta australis, the salicylic acid (SA) level in C. australis decreases, while its soybean host exhibits an increase in jasmonic acid (JA) content (Figure 1). These data strongly suggest that GPA feeding on C. australis induces a systemic signal, which is translocated to the host plant and activates its defense response against herbivorous insects (Zhuang et al., 2018; Byrd et al., 2023). Furthermore, the genetic variability within M. persicae populations enables the aphid to adapt to different host plants and environmental conditions, facilitating its persistence in diverse agro-ecosystems. These evolutionary responses underscore the need for continuous monitoring and the development of sustainable pest management strategies that integrate chemical, biological, and cultural control methods to effectively manage M. persicae populations. Figure 1 Changes of jasmonic acid (JA) and salicylic acid (SA) levels in Cuscuta australis and the soybean (Glycine max) host plants after green peach aphid (GPA) feeding onC. australis (Adopted from Zhuang et al., 2018) Image caption: (a) A schematic of the experimental setup. Empty clip cages or clip cages each containing 30 GPAs were attached to C. australis exploratory stems to form the control and treatment group, respectively. After 24 h of feeding, C. australis in the clip cages and the third trifoliates of soybean were harvested. The contents of SA and JA were determined in (b) C. australis and in (c) soybean leaves. Asterisks indicate significant differences between control and treatment groups determined by Student's t-test (n = 5; *, P < 0.05; **, P < 0.01). Error bars are ± SE (Adopted from Zhuang et al., 2018)
International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.5, 196-207 http://ecoevopublisher.com/index.php/ijmec 203 8 Integrated Management Strategies for Aphid Control 8.1 Biological control: natural predators and parasitoids Biological control is a cornerstone of integrated pest management strategies for aphid control, leveraging natural predators and parasitoids to reduce aphid populations. Predators such as lady beetles (Coccinellidae) and lacewings (Chrysopidae), along with parasitoids like those from the Aphidiidae family, have been shown to significantly decrease aphid densities. For instance, a study demonstrated that these natural enemies could reduce aphid populations by more than 65% on potato plants, highlighting their effectiveness in pest management. The interaction between aphid-resistant plants and natural enemies is also crucial, as it can enhance the overall control strategy. The presence of glandular trichomes on plants, for example, can complement the action of predators and parasitoids, leading to more effective aphid suppression. Moreover, the effectiveness of biological control can vary depending on the specialization of the predators and the environmental conditions. Specialist predators, either alone or in combination with generalists, have been found to exert the strongest control over aphid populations, particularly in grass and herb crops (Diehl et al., 2013). This suggests that maintaining a diverse community of natural enemies, including both specialist and generalist predators, can provide robust and complementary pest suppression. The presence of both predators and parasitoids can lead to more consistent aphid population control, as they exert complementary impacts without significant interference (Gontijo et al., 2015). 8.2 Chemical Control: Insecticides and Resistance Management Chemical control remains a prevalent method for managing aphid populations, particularly when rapid intervention is necessary. Insecticides such as organophosphates and pyrethroids are commonly used, but their effectiveness can be influenced by the development of resistance in aphid populations. For example, studies have shown that while insecticides can significantly reduce aphid numbers, the potential for resistance development necessitates careful management and integration with other control strategies (Hanson and Koch, 2018). The use of resistant plant varieties in conjunction with insecticides can lead to additive or even synergistic effects, enhancing the overall control of aphid populations. However, the rapid evolution of detoxification mechanisms in aphids poses a challenge to the long-term efficacy of chemical controls (Kamphuis et al., 2013). This underscores the importance of resistance management strategies, such as rotating insecticides with different modes of action and integrating them with biological control methods. By doing so, the risk of resistance development can be mitigated, ensuring the continued effectiveness of chemical controls in aphid management. 8.3 Agricultural Practices and Sustainable Aphid Management Approaches Sustainable aphid management requires a holistic approach that integrates various agricultural practices to enhance plant resistance and reduce reliance on chemical controls. One effective strategy is the use of plant varieties with inherent resistance to aphids, which can be achieved through the identification and deployment of resistance genes and quantitative trait loci (Kamphuis et al., 2013). These resistant plants can reduce aphid colonization and feeding, thereby decreasing the need for chemical interventions. Additionally, agricultural practices such as crop rotation, intercropping, and the use of cover crops can contribute to sustainable aphid management by disrupting aphid life cycles and enhancing the habitat for natural enemies. The release of specific volatile compounds by plants under aphid attack can also attract natural predators, providing an indirect form of resistance that can be harnessed in integrated pest management strategies. By combining these practices with biological and chemical controls, a more sustainable and effective approach to aphid management can be achieved, reducing the environmental impact and promoting long-term agricultural productivity. 9 Future Directions and Research Perspectives 9.1 Potential of genomic and CRISPR-based approaches in aphid research The advent of genomic tools and CRISPR technology presents significant opportunities for advancing aphid research. The sequencing of aphid genomes has already provided insights into their biology and evolution,
International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.5, 196-207 http://ecoevopublisher.com/index.php/ijmec 204 although challenges remain due to fragmented assemblies (Mandrioli and Manicardi, 2020). The development of comprehensive genomic resources, such as the complete genome sequence of aphids, is expected to enhance our understanding of their complex biological traits and interactions with host plants. CRISPR/Cas9 technology offers a promising avenue for manipulating plant susceptibility genes, potentially leading to the development of aphid-resistant crops (Åhman et al., 2019). By targeting specific genes that aphids exploit to enhance their survival and reproduction, researchers can create plants that are less hospitable to these pests, thereby reducing their impact on agriculture. 9.2 Climate change and its implications for aphid-plant interactions Climate change is likely to have profound effects on aphid-plant interactions. Changes in temperature and precipitation patterns can influence aphid population dynamics, distribution, and the timing of their life cycles (Huang and Qiao, 2014). These environmental shifts may alter the ecological balance between aphids and their natural enemies, potentially leading to increased aphid outbreaks. Additionally, climate change can affect plant physiology and defense mechanisms, which in turn impacts aphid feeding behavior and success (Züst and Agrawal, 2016). Understanding these interactions in the context of a changing climate is crucial for developing adaptive management strategies to mitigate the impact of aphids on crops. 9.3 Integrating ecological and evolutionary perspectives for sustainable agriculture To achieve sustainable agricultural practices, it is essential to integrate ecological and evolutionary perspectives in the study of aphid-plant interactions. This involves understanding the co-evolutionary dynamics between aphids and their host plants, as well as the role of ecological factors such as plant diversity and soil microbiomes (Xi et al., 2024). By leveraging knowledge of plant resistance mechanisms and aphid adaptation strategies, researchers can develop integrated pest management approaches that are both effective and environmentally friendly. This holistic approach not only aims to control aphid populations but also to enhance the resilience of agricultural systems against pest pressures. Acknowledgments The author extends sincere thanks to two anonymous peer reviewers for their feedback on the manuscript. Conflict of Interest Disclosure The author affirms that this research was conducted without any commercial or financial relationships that could be construed as a potential conflict of interest. References Åhman I., Kim S., and Zhu L., 2019, Plant genes benefitting aphids—potential for exploitation in resistance breeding, Frontiers in Plant Science, 10: 1452. https://doi.org/10.3389/fpls.2019.01452 PMid:31798609 PMCid:PMC6874142 Boulain H., Legeai F., Guy E., Morlière S., Douglas N., Oh J., Murugan M., Smith M., Jaquiéry J., Peccoud J., White F., Carolan J., Simon J., and Sugio A., 2018, Fast evolution and lineage-specific gene family expansions of aphid salivary effectors driven by interactions with host plants, Genome Biology and Evolution, 10: 1554-1572. https://doi.org/10.1093/gbe/evy097 PMid:29788052 PMCid:PMC6012102 Byrd D., Tran M., Kenney J., Wilson‐Rankin E., and Mauck K., 2023, The aphid Myzus persicae (Hemiptera: Aphididae) acquires chloroplast DNA during feeding on host plants, Environmental Entomology, 52: 900-906. https://doi.org/10.1093/ee/nvad086 PMid:37656634 Cao H., Liu H., Zhang Z., and Liu T., 2016, The green peach aphid Myzus persicae perform better on pre-infested Chinese cabbage Brassica pekinensis by enhancing host plant nutritional quality, Scientific Reports, 6(1): 21954. https://doi.org/10.1038/srep21954 Carolan J., Caragea D., Reardon K., Mutti N., Dittmer N., Pappan K., Cui F., Castaneto M., Poulain J., Dossat C., Tagu D., Reese J., Reeck G., Wilkinson T., and Edwards O., 2011, Predicted effector molecules in the salivary secretome of the pea aphid (Acyrthosiphon pisum): a dual transcriptomic/proteomic approach, Journal of Proteome Research, 10(4): 1505-1518. https://doi.org/10.1021/pr100881q
International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.5, 196-207 http://ecoevopublisher.com/index.php/ijmec 205 De Vos M., and Jander G., 2009, Myzus persicae (green peach aphid) salivary components induce defence responses in Arabidopsis thaliana, Plant, Cell & Environment, 32(11): 1548-1560. https://doi.org/10.1111/j.1365-3040.2009.02019.x Diehl E., Sereda E., Wolters V., and Birkhofer K., 2013, Effects of predator specialization, host plant and climate on biological control of aphids by natural enemies: a meta-analysis, Journal of Applied Ecology, 50: 262-270. https://doi.org/10.1111/1365-2664.12032 Divekar P., Narayana S., Divekar B., Kumar R., Gadratagi B., Ray A., Singh A., Rani V., Singh V., Singh A., Kumar A., Singh R., Meena R., and Behera T., 2022, Plant secondary metabolites as defense tools against herbivores for sustainable crop protection, International Journal of Molecular Sciences, 23(5): 2690. https://doi.org/10.3390/ijms23052690 PMid:35269836 PMCid:PMC8910576 Elzinga D., De Vos M., and Jander G., 2014, Suppression of plant defenses by a Myzus persicae (green peach aphid) salivary effector protein, Molecular Plant-Microbe Interactions, 27(7): 747-756. https://doi.org/10.1094/MPMI-01-14-0018-R PMid:24654979 PMCid:PMC4170801 Enders L., and Hefley T., 2023, Modeling host–microbiome interactions to improve mechanistic understanding of aphid-vectored plant pathogens, Frontiers in Ecology and Evolution, 11: 1251165. https://doi.org/10.3389/fevo.2023.1251165 Evans E., 2008, Multitrophic interactions among plants, aphids, alternate prey and shared natural enemies-a review, European Journal of Endocrinology, 105: 369-380. https://doi.org/10.14411/EJE.2008.047 Gatehouse J., 2002, Plant resistance towards insect herbivores: a dynamic interaction, The New Phytologist, 156(2): 145-169. https://doi.org/10.1046/j.1469-8137.2002.00519.x PMid:33873279 Giordanengo P., Brunissen L., Rustérucci C., Vincent C., Van Bel A., Dinant S., Girousse C., Faucher M., and Bonnemain J., 2010, Compatible plant–aphid interactions: how aphids manipulate plant responses, Comptes Rendus Biologies, 333(6-7): 516-523. https://doi.org/10.1016/j.crvi.2010.03.007 PMid:20541163 Goggin F., 2007, Plant–aphid interactions: molecular and ecological perspectives, Current Opinion in Plant Biology, 10(4): 399-408. https://doi.org/10.1016/j.pbi.2007.06.004 PMid:17652010 Gontijo L., Beers E., and Snyder W., 2015, Complementary suppression of aphids by predators and parasitoids, Biological Control, 90: 83-91. https://doi.org/10.1016/j.biocontrol.2015.06.002 Guerrieri E., and Digilio M., 2008, Aphid–plant interactions: a review, Journal of Plant Interactions, 3: 223-232. https://doi.org/10.1080/17429140802567173 Hanson A., and Koch R., 2018, Interactions of host-plant resistance and foliar insecticides for soybean aphid management, Crop Protection, 112: 232-238. https://doi.org/10.1016/j.cropro.2018.06.008 Huang X., and Qiao G., 2014, Aphids as models for ecological and evolutionary studies, Insect Science, 21(3): 247-250. https://doi.org/10.1111/1744-7917.12130 Jaber L., and Araj S., 2018, Interactions among endophytic fungal entomopathogens (Ascomycota: Hypocreales), the green peach aphid Myzus persicae Sulzer (Homoptera: Aphididae), and the aphid endoparasitoid Aphidius colemani Viereck (Hymenoptera: Braconidae), Biological Control, 116: 53-61. https://doi.org/10.1016/j.biocontrol.2017.04.005 Jaouannet M., Rodriguez P., Thorpe P., Lenoir C., MacLeod R., Escudero-Martinez C., and Bos J., 2014, Plant immunity in plant–aphid interactions, Frontiers in Plant Science, 5: 663. https://doi.org/10.3389/fpls.2014.00663 PMid:25520727 PMCid:PMC4249712 Jayasinghe W., Akhter M., Nakahara K., and Maruthi M., 2021, Effect of aphid biology and morphology on plant virus transmission, Pest Management Science, 78(2): 416-427. https://doi.org/10.1002/ps.6629 PMid:34478603 Joffrey M., Chesnais Q., Spicher F., Verrier E., Ameline A., and Couty A., 2017, Plant virus infection influences bottom-up regulation of a plant–aphid–parasitoid system, Journal of Pest Science, 91: 361-372. https://doi.org/10.1007/s10340-017-0911-7 Kamphuis L., Zulak K., Gao L., Anderson J., and Singh K., 2013, Plant-aphid interactions with a focus on legumes, Functional Plant Biology, 40(12): 1271-1284. https://doi.org/10.1071/FP13090 PMid:32481194
International Journal of Molecular Ecology and Conservation 2024, Vol.14, No.5, 196-207 http://ecoevopublisher.com/index.php/ijmec 206 Kant M., Jonckheere W., Knegt B., Lemos F., Liu J., Schimmel B., Villarroel C., Ataíde L., Dermauw W., Glas J., Egas M., Janssen A., Van Leeuwen T., Schuurink R., Sabelis M., and Alba J., 2015, Mechanisms and ecological consequences of plant defence induction and suppression in herbivore communities, Annals of Botany, 115(7): 1015-1051. https://doi.org/10.1093/aob/mcv054 PMid:26019168 PMCid:PMC4648464 Kaplan I., Halitschke R., Kessler A., Sardanelli S., and Denno R., 2008, Constitutive and induced defenses to herbivory in above- and belowground plant tissues, Ecology, 89(2): 392-406. https://doi.org/10.1890/07-0471.1 Karalija E., Šamec D., Dahija S., and Ibragić S., 2023, Plants strike back: plant volatiles and their role in indirect defence against aphids, Physiologia Plantarum, 175(1): e13850. https://doi.org/10.1111/ppl.13850 Krieger C., Halter D., Baltenweck R., Cognat V., Boissinot S., Maia-Grondard A., Erdinger M., Bogaert F., Pichon E., Hugueney P., Brault V., and Ziegler-Graff V., 2023, An aphid-transmitted virus reduces the host plant response to its vector to promote its transmission, Phytopathology, 113(9): 1745-1760. https://doi.org/10.1094/PHYTO-12-22-0454-FI Mandrioli M., and Manicardi G., 2020, Evolutionary insights into the aphid genome: aphid genomics between quality problems and intriguing perspectives, International Review of Cell and Molecular Biology, 354: 215-230. https://doi.org/10.1016/bs.ircmb.2020.03.003 Nalam V., Louis J., and Shah J., 2019, Plant defense against aphids, the pest extraordinaire, Plant Science, 279: 96-107. https://doi.org/10.1016/j.plantsci.2018.04.027 O'Neal M., Varenhorst A., and Kaiser M., 2018, Rapid evolution to host plant resistance by an invasive herbivore: soybean aphid (Aphis glycines) virulence in North America to aphid-resistant cultivars, Current Opinion in Insect Science, 26: 1-7. https://doi.org/10.1016/j.cois.2017.12.006 Powell G., Tosh C., and Hardie J., 2006, Host plant selection by aphids: behavioral, evolutionary, and applied perspectives, Annual Review of Entomology, 51: 309-330. https://doi.org/10.1146/annurev.ento.51.110104.151107 Sadek R., Elbanna S., and Semida F., 2013, Aphid–host plant interaction, Open Journal of Animal Sciences, 3: 16-27. https://doi.org/10.4236/ojas.2013.32A003 Sadras V., Vázquez C., Garzo E., Moreno A., Medina S., Taylor J., and Fereres A., 2021, The role of plant labile carbohydrates and nitrogen on wheat–aphid relations, Scientific Reports, 11(1): 12529. https://doi.org/10.1038/s41598-021-91424-8 Sial M., Mehmood K., Saeed S., Husain M., Rasool K., and Aldawood A., 2022, Neonicotinoid’s resistance monitoring, diagnostic mechanisms and cytochrome P450 expression in green peach aphid [Myzus persicae (Sulzer) (Hemiptera: Aphididae)], PLOS ONE, 17(1): e0261090. https://doi.org/10.1371/journal.pone.0261090 Van Munster M., 2020, Impact of abiotic stresses on plant virus transmission by aphids, Viruses, 12(2): 216. https://doi.org/10.3390/v12020216 Voelckel C., Weisser W., and Baldwin I., 2004, An analysis of plant–aphid interactions by different microarray hybridization strategies, Molecular Ecology, 13(10): 3187-3195. https://doi.org/10.1111/j.1365-294X.2004.02297.x Wang Q., Yuan E., Ling X., Zhu‐Salzman K., Guo H., Ge F., and Sun Y., 2020, An aphid facultative symbiont suppresses plant defense by manipulating aphid gene expression in salivary glands, Plant, Cell & Environment, 43(9): 2311-2322. https://doi.org/10.22541/au.158775695.51933358 Ward S., Jalali T., Van Rooyen A., Reidy‐Crofts J., Moore K., Edwards O., and Umina P., 2023, The evolving story of sulfoxaflor resistance in the green peach aphid (Myzus persicae (Sulzer)), Pest Management Science, 80(2): 866-873. https://doi.org/10.1002/ps.7821 Wooley S., Smith D., Lonsdorf E., Brown S., Whitham T., Shuster S., and Lindroth R., 2020, Local adaptation and rapid evolution of aphids in response to genetic interactions with their cottonwood hosts, Ecology and Evolution, 10: 10532-10542. https://doi.org/10.1002/ece3.6709 Xi X., Dean A., and Zytynska S., 2024, Microbe-induced plant resistance alters aphid inter-genotypic competition leading to rapid evolution with consequences for plant growth and aphid abundance, Oikos, 2024(6): e10426. https://doi.org/10.1111/oik.10426 Yates-Stewart A., Daron J., Wijeratne S., Shahid S., Edgington H., Slotkin R., and Michel A., 2020, Soybean aphids adapted to host-plant resistance by downregulating putative effectors and upregulating transposable elements, Insect Biochemistry and Molecular Biology, 121: 103363. https://doi.org/10.1016/j.ibmb.2020.103363 Zhang Y., Liu X., Francis F., Xie H., Fan J., Wang Q., Liu H., Sun Y., and Chen J., 2022, The salivary effector protein Sg2204 in the greenbug Schizaphis graminumsuppresses wheat defence and is essential for enabling aphid feeding on host plants, Plant Biotechnology Journal, 20: 2187-2201. https://doi.org/10.1111/pbi.13900
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