Genomics and Applied Biology 2024, Vol.15, No.6, 296-306 http://bioscipublisher.com/index.php/gab 304 screening methods to evaluate the drought tolerance of commercial soybean cultivars under realistic field conditions (Arya et al., 2021; Gebre et al., 2022; Xu et al., 2023). These advancements will enable more efficient and precise identification of drought-tolerant genotypes, accelerating the breeding and development of resilient soybean varieties (Dhungana et al., 2021). By addressing these challenges and pursuing these future research directions, the scientific community can make significant strides in understanding and improving drought tolerance in soybeans, ultimately enhancing crop productivity and resilience in the face of climate change. 7 Concluding Remarks This study has provided a comprehensive analysis of the physiological responses and variety screening for drought tolerance in soybeans during the critical flowering and podding stages. Key findings include biochemical mechanisms, where drought stress significantly increased the activities of antioxidative enzymes such as ascorbate peroxidase (APX), guaiacol peroxidase (GPX), and glutathione reductase (GR) in certain soybean cultivars, particularly at the flowering stage. These enzymes play a crucial role in minimizing hydrogen peroxide (H2O2) production and lipid peroxidation, thereby enhancing drought tolerance. Proline and total soluble sugars (TSS) were found to be important osmotic regulators under drought conditions. Their levels increased significantly in response to drought, aiding in osmotic adjustment and stress mitigation. Drought stress adversely affected various morpho-physiological traits such as leaf production, plant height, stem girth, and leaf area. However, certain genotypes like AGS383 showed minimal adverse effects, maintaining healthier growth and higher yield under drought conditions. Significant genotypic variations were observed in drought tolerance. Some genotypes, such as AGS429 and AGS383, exhibited superior drought tolerance by maintaining higher photosynthetic efficiency, water use efficiency, and biochemical stability. The findings of this study have several important implications for soybean production and food security: Breeding programs can benefit from the identification of drought-tolerant genotypes such as AGS429 and AGS383. These genotypes provide valuable genetic resources for breeding programs aimed at developing high-yielding, drought-tolerant soybean varieties. They can be used as parent material to enhance drought tolerance in future cultivars. Understanding the physiological and biochemical responses of soybeans to drought stress can inform agronomic practices. For instance, the application of osmoprotectants or antioxidants could be explored to mitigate drought stress and improve yield stability. As climate change intensifies the frequency and severity of droughts, the development and cultivation of drought-tolerant soybean varieties will be crucial for ensuring food security. These varieties can help stabilize soybean production in drought-prone regions, thereby contributing to global food security. In conclusion, this study underscores the importance of screening and identifying drought-tolerant soybean varieties to enhance resilience against water-deficit conditions. Future research should focus on further investigation into the molecular mechanisms underlying drought tolerance, including gene expression and regulatory pathways, which will provide deeper insights into the genetic basis of drought resilience. Conducting extensive field trials across different environmental conditions will validate the laboratory findings and ensure the practical applicability of drought-tolerant genotypes. Combining physiological, biochemical, and molecular approaches will offer a holistic understanding of drought tolerance and facilitate the development of robust, high-yielding soybean varieties capable of withstanding drought stress. By addressing these areas, we can make significant strides in improving soybean production and ensuring food security in the face of climate change. Acknowledgments The authors sincerely thank the two anonymous peer reviewers for their valuable comments and suggestions on the manuscript. Funding This work was supported by the Project of Science and technology of Shenyang, China (22-318-2-05).
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