抄録
Under increasing water resource constraints and the transition of rice production toward water-saving and high-efficiency systems, alternate wetting and drying (AWD) irrigation has become an important cultivation strategy. However, the physiological mechanisms underlying its interaction with plant growth regulators in regulating rice growth and yield remain unclear. This study investigated the combined effects of AWD irrigation and exogenous plant growth regulators on photosynthetic function, endogenous hormone balance, assimilate translocation, and yield formation in rice. Field experiments were conducted under different AWD regimes with plant growth regulator treatments, and post-heading leaf photosynthetic traits, endogenous hormone contents, dry matter accumulation and partitioning, and yield components were systematically analyzed. The results showed that moderate AWD irrigation delayed leaf senescence, optimized endogenous hormone balance, and enhanced assimilate accumulation and translocation to panicles, thereby promoting yield formation. The application of plant growth regulators further improved leaf photosynthetic capacity and assimilate allocation efficiency, showing a clear synergistic effect with AWD irrigation. This interaction enhanced rice yield stability by prolonging the functional duration of photosynthetic leaves and improving assimilate transport efficiency. Overall, the coordinated application of AWD irrigation and plant growth regulators provides an effective physiological regulation strategy for improving rice productivity under water-saving cultivation conditions.
