玉米品种抗旱性筛选指标研究

Analysis on Criteria for Screening Drought Tolerant Maize Hybrids

提高玉米品种的抗旱性是减小因干旱带来损失的经济而有效的途径之一。玉米品种的抗旱性筛选指标缺乏系统研究,还没有形成一套完整的鉴定体系。产量指标是玉米品种抗旱性鉴定的最重要指标。本研究通过13个玉米品种的抗旱性鉴定试验,对以产量为基准的不同鉴定筛选指标进行了分析比较,算术平均生产力(MP)、几何平均生产力(GMP)和耐旱指数(DTIv)可作为鉴定抗旱性的首选指标;耐旱指数(DTIv)能更好地作为不同地点和不同环境条件下进行抗旱性鉴定的筛选指标。

The improvement of maize hybrids with drought resistance is one of economic and effective approaches to reducing the yield loss caused by drought. However, there have no systematic studies on screening index for maize hybrids of many drought resistance. The yield is one of the important index for screening drought resistance maize hybrids. After grain yields of 13 maize hybrids were analyzed and the features of different screening index were compared,it was found that for screening hybrids with drought resistance, mean productivity（MP）, geometric mean productivity （GMP） and drought index for varieties （DTIv） are the most important index, which is better in different environment and places.