玉米品种抗旱性指标筛选的研究

Screening of Drought Tolerant Indices of Maize Hybrids

提高玉米品种的抗旱性是减少干旱带来损失的有效途径之一。产量指标又是玉米品种抗旱性鉴定的最重要指标。本研究通过36个玉米品种抗旱性鉴定试验,对以产量为基准的不同鉴定筛选指标进行了分析比较。结果表明:算术平均值(MP)、几何平均值(GMP)、耐旱指数(DTIv)和抗旱指数(DRI)可以作为鉴定品种抗旱性的主要筛选指标;耐旱指数(DTIv)优于抗旱指数(DRI)能更好地作为不同地点和不同环境条件下抗旱性鉴定筛选指标。

The improvement of maize hybrids with drought tolerance is one of effective approaches to reducing the yield loss caused by drought. The yield is one of the important index for screening drought tolerant maize hybrids. After grain yields of 36 maize hybrids were analyzed and the features of different screening index were compared, the results showed that for screening hybrids with drought tolerance, mean productivity （MP）, geometric mean productivity （GMP）, drought index for varieties （DTIv） and drought tolerance index （DTI） were the most important indexes, and drought index for varieties （DTIv） was better than drought tolerance index （DTI） in different environment and places.