MMR_2024v14n3

Molecular Microbiology Research 2024, Vol.14, No.3, 153-161 http://microbescipublisher.com/index.php/mmr 157 4.3 Reduced need for chemical inputs The use of non-rhizobial endophytic microbes in rice cultivation can significantly reduce the need for chemical inputs such as fertilizers and pesticides. These microbes enhance nutrient uptake and assimilation, thereby reducing the dependency on chemical fertilizers (Saha et al., 2016). They also offer a natural means of pest and disease control, which can decrease the reliance on chemical pesticides (White et al., 2019). This not only makes rice cultivation more sustainable but also reduces the environmental impact associated with chemical inputs. The application of non-rhizobial endophytic microbes in rice cultivation offers multiple benefits, including improved yield and quality, enhanced stress tolerance, and reduced need for chemical inputs. These advantages make them a promising tool for sustainable and resilient rice farming. 5 Application Strategies in Rice Cultivation 5.1 Inoculation techniques Inoculation techniques for non-rhizobial endophytic microbes in rice cultivation involve several methods to ensure effective colonization and growth promotion. One approach is the use of a consortium of endophytic microbes, such as those isolated fromTypha angustifolia, which have shown significant benefits in rice growth by enhancing nitrogen metabolism and biomass production. Another method includes the co-inoculation of rhizosphere and endophytic bacteria, which has been demonstrated to reduce the need for chemical nitrogen fertilizers while maintaining or even improving rice growth indices. Additionally, large-scale field inoculation trials with endophytic strains, such as Rhizobium leguminosarumbv. trifolii, have proven effective in increasing grain yield and overall plant health (Yanni and Dazzo, 2010). 5.2 Integration with traditional farming practices Integrating non-rhizobial endophytic microbes with traditional farming practices can enhance the sustainability and productivity of rice cultivation. For instance, the natural endophytic association between Rhizobium leguminosarumbv. trifolii and rice roots in fields rotated with clover has been shown to significantly improve rice growth and yield. This integration reduces the dependency on chemical fertilizers and leverages the benefits of crop rotation. Furthermore, the use of microbial inoculants as part of integrated nutrient management strategies can optimize fertilizer use and promote healthier plant growth (Etesami and Alikhani, 2016). The application of these microbes in conjunction with traditional practices can lead to more sustainable and eco-friendly rice production systems (Doni et al., 2022). 5.3 Monitoring and assessment Monitoring and assessment of the application of non-rhizobial endophytic microbes in rice cultivation are crucial for understanding their impact and optimizing their use. Techniques such as 16S rDNA taxonomic profiling can be employed to study the diversity and colonization patterns of endophytic and rhizospheric bacteria in rice roots (Moronta-Barrios et al., 2018). Long-term field trials and greenhouse experiments are essential to evaluate the effectiveness of microbial inoculants under various environmental conditions (Hernández et al., 2021). Regular assessment of plant growth parameters, nitrogen uptake, and gene expression related to nitrogen metabolism can provide insights into the mechanisms of growth promotion and help refine inoculation strategies. By continuously monitoring and assessing these factors, farmers and researchers can ensure the successful implementation of non-rhizobial endophytic microbes in rice cultivation. 6 Case Studies and Field Trials 6.1 Successful applications in various regions Several studies have demonstrated the successful application of non-rhizobial endophytic microbes in rice cultivation across different regions. Endophytic bacteria such as Bacillus haynesii and Bacillus safensis have been shown to alleviate salinity stress in rice, further demonstrating the versatility and effectiveness of these microbes in different environmental conditions (Figure 2) (Gupta et al., 2023). A consortium of endophytic microbes isolated fromTypha angustifolia significantly improved nitrogen metabolism and overall growth in rice plants.

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