玉米毛状根再生植株对水分胁迫的响应

Responses of maize regenerative plants from hairy root cultures to water stress

摘要: 为研究玉米根系对水分胁迫的响应，以玉米毛状根再生植株为材料，在水分胁迫下，测量其生育时期的植株生长和生理指标。结果表明，水分胁迫下玉米毛状根再生植株光合速率、蒸腾速率、细胞间隙CO2浓度、气孔导度均较高。水分胁迫下，毛状根再生植株的根系水导降幅最小，为13.2%，对照品种H99下降了84.7%。各营养器官含水率最高，叶渗透调节能力增强。这说明由于毛状根再生植株强大的根系，保证了植株生长发育过程中的水分供应和光合能力。

Abstract: To study the responses of maize roots to water stress, characteristics of plant growth and physiological in maize regenerative plants under water stress at different development stages were systemically studied. The photosynthesis rate, transpiration rate, intercellular CO2 concentrations, and stomatal conductance were all high under water stress at the regenertive plants from hairy root culture in maize. Under water stress condition, whole root hydraulic conductivity of regenerative plants from hairy root culture decreased by 13.2%, H99 decreased by 84.7%. Water content of vegetative organs increased and leaf osmotic adjustment ability enhanced. The results showed that the regenerative plants from hairy root culture in maize with strong root system can provide guarantee for plant water supply and photosynthesis during growth and developmental stages.