在水分胁迫下,研究了18份玉米自交系苗期的植株性状表现.9份耐旱系(313、旱23、中自01、C8065、52106、自330、X178、P138和HC)的叶面积指数和叶片相对含水量较高,光合能力和干物质积累强,耐旱系数较大,胁迫解除后植株恢复生长.9份耐旱性较差的自交系(魯原92、豫12、中黄204、B73、金黄96B、S7913、S37、郑22和综31)随着胁迫强度增大,叶面积指数和叶片相对含水量迅速降低,光合能力和干物质积累减少,复水后植株不能恢复生长.叶片相对含水量和耐旱系数是玉米苗期耐旱性的重要特征.随胁迫增强,耐旱性强的自交系叶片相对含水量和耐旱系数明显大于耐旱性弱的自交系.研究结果为苗期玉米耐旱种质筛选和改良提供了初步信息。

Eighteen inbred lines were investigated for drought responses at seedling stage under wader water stress. Nine inbred lines (313,Han23,Zhongzi01,C8065,52106,Ai330,X178,P138,HC)were found to be drought toler-ant, which showed higher leaf area index,relarive moisture content,photosynthesis and drought tolerant index, while the case is reverse for nine drought susceptible lines (Luyuan92,Yu12,Zhonghuang204,B73,Jinhuang96B,S7913,S37,Zheng22,Zong31).Leaf relative moisture conture content and drought tolerant index were two important traits indicat-ing drought responses in maize at seedling stage.The results obtained in thei paper provided useful information for germplasm screening and improvement at seedling stage in maize.

国家"863"计划节水重大专项(2002AA2Z4011)