玉米品种抗旱性评价体系研究

利用生产上常用的32个玉米品种，在PVC大棚和旱棚内设干旱胁迫和正常浇水两种处理，测定叶片相对含水量等24个指标与玉米抗旱性的关系。通过简单相关分析和逐步回归分析筛选出5个指标，苗期胁迫后叶片水势和对照比值、抽雄吐丝期胁迫后叶片保水力和对照比值、胁迫后行粒数、单株轴重、百粒重和对照比值。根据逐步回归筛选出的指标及其偏相关系数，建立了不同时期的评价(D值)方程和评价体系。

Study on Drought-resistance Evaluation System of Maize Cultivars

Thirty-two maize cultivars were planted in the PVC shed and drought shed, with the drought-stress and no-stress treatments designed; twenty-four indexes were monitored. According to the results of simple relative analyses and stepwise regression analysis, five indexes were selected including the relative value of leaf water potential at seedling stage, leaf water conservation at silking stages, kernel per row, axis weight per plant and weight of 100 grains. According to these indexes and partial relative coefficient, evaluation equation (D value) and evaluation system were established. Moreover, all varieties had a drought assessment using this system.