International Journal of Molecular Evolution and Biodiversity, 2025, Vol.15, No.2, 84-98 http://ecoevopublisher.com/index.php/ijmeb 95 which puts higher demands on stress resistance research. Therefore, drought resistance research is gradually transforming to adaptive mechanisms under the background of multiple stresses. In-depth revelation of the interactions between these stresses and exploration of the key genetic and physiological mechanisms that control multi-stress tolerance will help to develop more forward-looking breeding strategies. 8.4 Policy and economic considerations in drought-resistant rapeseed breeding The cultivation and promotion of drought-resistant rapeseed varieties cannot be separated from the dual drive of policy support and economic guidance. Strong institutional guarantees are particularly critical, which requires government departments to take practical measures in resource allocation and mechanism design - both to increase financial support for drought resistance research and to build a dynamic regulatory framework to regulate the agricultural application of biotechnology. It is worth noting that the improvement of the intellectual property system is also crucial, which is to stimulate innovation vitality and prevent technical barriers to ensure that new varieties can enter the market smoothly (Chaghakaboodi et al., 2021). Market acceptance determines the actual promotion effect of drought-resistant varieties, and its core lies in whether it can create sustainable and stable economic benefits for farmers. The ideal drought-resistant characteristics should not be limited to the improvement of physiological parameters in the laboratory, but should be transformed into yield stability and risk resistance in field planting. To achieve this goal, single variety improvement is obviously not enough. A multi-dimensional support system must be established: lower the planting threshold through seed price subsidies, diversify production risks with the help of drought insurance, and introduce financial instruments to alleviate transformation pressure. This synergy between policy and market will not only significantly enhance farmers' willingness to plant, but also accelerate the realization of agricultural sustainable development goals. 9 Concluding Remarks In recent years, research on the genetic mechanism of drought resistance in rapeseed has made important breakthroughs, and the functions of multiple key regulatory factors have been revealed one after another, laying a molecular foundation for analyzing the plant drought response network. Taking BnA.JAZ5 as an example, this protein regulates stomatal dynamics through the ABA signaling pathway and directly participates in the perception and transduction process of drought signals. It is worth noting that the DELLA family member BnaA6.RGA exhibits a unique regulatory function - it can cooperate with ABA signaling molecules to activate multiple drought resistance gene expression pathways, thereby significantly improving the plant's ability to adapt to water stress environments. In terms of physiological performance, drought-resistant rapeseed varieties show multi-dimensional advantages. Its efficient antioxidant enzyme system can remove reactive oxygen in a timely manner and effectively reduce oxidative damage. These varieties also have stronger osmotic regulation capabilities, can better maintain chlorophyll content and inhibit MDA accumulation, and ultimately show a more stable physiological state and stronger stress resistance under drought conditions. Further transcriptome analysis showed that drought-resistant varieties constructed a more efficient defense network at the genetic level. This network not only involves the ROS removal system, but also includes the precise regulation mechanism of the plant development cycle, so as to achieve rapid perception and dynamic adaptation to the drought environment. The above results have laid a theoretical foundation for the genetic improvement of rapeseed drought resistance in the future, and also provided a practical path for building an oilseed production system with environmental resilience. As climate change continues to drive drought frequency and intensification, building a stable and efficient drought resistance strategy has become a key direction of agricultural research. The integration of traditional breeding experience and modern molecular breeding tools constitutes a realistic path to achieve precision breeding. For example, genome-wide association analysis (GWAS) and systematic identification of key drought-resistant genotypes provide strong support for the selection of breeding materials and the cultivation of new materials.
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