International Journal of Molecular Evolution and Biodiversity, 2025, Vol.15, No.2, 99-110 http://ecoevopublisher.com/index.php/ijmeb 107 experimental materials and conditions for subsequent genetic improvement and functional research (Koskela et al., 2014; Fang, 2024), thus building a resource protection system with wide coverage and complete mechanisms. 6.3 Molecular breeding based on superior genes The high-quality gene resources contained in the germplasm of Lindera aggregata in Qingchuan provide an important foundation for molecular breeding. Marker-assisted selection (MAS) technology achieves precise selection of excellent characteristics such as high volatile oil content and strong stress resistance by establishing a stable association between molecular markers and target traits (Upadhyaya et al., 2008; Fang, 2024). This technological breakthrough significantly improved the efficiency and accuracy of breeding. Breakthroughs in gene editing technology have opened up new avenues for the genetic improvement of Lindera aggregata. The CRISPR/Cas9 system can accurately modify genes related to secondary metabolism and stress resistance. Experiments have confirmed that the volatile oil synthesis pathway can be effectively regulated by targeted editing of terpene synthase genes (Shi et al., 2024a). The integrated application of these cutting-edge technologies is pushing Lindera aggregata breeding into a new stage of precision and efficiency. 7 Challenges and Future Directions 7.1 Technical challenges in genetic resource analysis There are still many technical challenges in the study of the genetic resources of Linderae obesa. Although the application of high-throughput sequencing technology provides a new perspective for analyzing genetic diversity, the genomic characteristics of the species itself - including large genome capacity, polyploidy and a high proportion of repetitive sequences - significantly increase the difficulty of data acquisition and analysis. These factors not only increase the cost of research, but also put forward higher requirements for genome assembly and homologous gene identification (Shi et al., 2024b). The functional verification link also faces technical obstacles. Gene editing and expression regulation experiments require the establishment of an efficient genetic transformation system, and the long growth cycle of Linderae obesa greatly delays the phenotypic observation process. More importantly, there is currently a lack of standardized genetic operation platforms, which seriously restricts the depth of gene function research and the efficiency of application transformation (Salleh, 2020). Breaking through these technical bottlenecks will become an important direction for future research. 7.2 Practical bottlenecks in superior gene application Although a series of excellent genotypes with potential have been successfully screened at the laboratory level, there are still many technical and practical obstacles to successfully transforming these achievements into real breeding materials. At present, molecular breeding methods have not yet formed an efficient connection with the traditional agricultural production system, and the lack of an innovation chain covering the entire process of "experiment-verification-promotion" has become a key constraint (Chung et al., 2023). In addition, some improved traits, such as high volatile oil content, need to be verified through cross-regional, multi-year field trials for their stability and environmental adaptability (Gu et al., 2010). However, the high human and material investment required for such long-term experiments seriously limits its feasibility in large-scale promotion. Technology promotion also faces the problem of uneven resource allocation. Grassroots production units generally lack the necessary technical equipment and professionals, making it difficult to implement advanced breeding methods. More complicated is that the regulatory policies and intellectual property disputes of gene-edited crops have set additional obstacles to the commercialization of improved varieties (Koskela et al., 2014). To break through these difficulties, it is necessary to establish a collaborative innovation mechanism between industry, academia and research to promote the benign interaction between technological innovation and policy improvement. 7.3 Future research directions The integration of multi-omics technologies will become the core direction of Lindera aggregata research. Integrating genomic, transcriptomic, proteomic and metabolomic data can systematically reveal the molecular
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