不同时期水分胁迫对玉米生长的后效性影响  

Aftereffects of water stress on corn growth atdifferent stages

作　　者：郝树荣[1,2] 郭相平[2] 王文娟[2] 

机构地区：[1]河海大学南方地区高效灌排与农业水土环境教育部重点实验室,南京210098 [2]河海大学水利水电学院,南京210098

出　　处：《农业工程学报》2010年第7期71-75,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(50309003)

摘　　要：为了确定最佳的灌水模式,有必要对前期水分胁迫对玉米生育后期衰老及产量的后效性进行研究,该文通过盆栽和小区试验,得到以下结果:前期适度的胁迫后复水使玉米后期保持了较大的光合面积、维持了光合系统的活性、缓解了衰老过程中质膜的氧化作用,降低了叶绿素降解速度,使功能叶在生育后期维持了较高的光合效率,有利于干物质累积和产量的提高。说明玉米前期旱后复水后效性明显,尤以苗后期胁迫、拔节初期短历时轻旱后效性最佳。In order to determine best irrigation mode,it is necessary to research on water stress aftereffects to corn yieldand senescence in the early corn growth stage.By pot and plot experiments,the results show that moderate rewateringafter water stress in initial corn growing season can preserve large photosynthetic area,keep photosynthetic systemactivity,delay chlorophyll degradation and enable functional leaves to maintain high photosynthetic efficiency,which iseventually beneficial to dry matter accumulation during final growing season of corn.It proves that the post-droughrewatering in the initial corn growing stage has obvious aftereffects.Particularly,the aftereffects are significant afterwater stress at late stage of seedlings and short-duration light drought at early jointing stage.

关 键 词：水分 光合作用 产量 玉米 水分胁迫 后效性 

分 类 号：S311[农业科学—作物栽培与耕作技术]