本试验以80份吉林省玉米骨干自交系为试材，在温室条件下进行苗期干旱胁迫模拟，胁迫完成后测定株高、茎粗、根鲜重、地上部分鲜重、根干重、地上部分干重等6项形态指标，估算各性状指标的耐旱系数并作为评价参数，进行主成分分析和聚类分析综合评价参试玉米自交系苗期耐旱性。结果表明：干旱胁迫组测定的形态指标数据与对照组相比均降低，变异幅度有明显差异；根鲜重耐旱系数、地上干重耐旱系数作为综合指标对玉米自交系苗期耐旱性评价的贡献率优于其它指标；聚类分析将参试玉米自交系划分出5个耐旱等级：4份为极强耐旱，18份为强耐旱，25份为中度耐旱，22份为弱耐旱，11份为极弱耐旱。
英文摘要:
In this experiment, 80 portions of elite maize inbred lines in Jilin Province were used as test materials, simulated seedling drought stress under the greenhouse conditions, after drought stress, 6 morphological indexes including the plant height, stem diameter, root fresh weight, fresh weight of ground parts, root dry weight and dry weight on the ground were measured, estimated the drought tolerance coefficient of each character index as evaluation parameter, the principal component analysis and cluster analysis were performed to evaluate the drought tolerance of testing maize inbred lines comprehensively. The results showed that the morphological index data of drought stress group were lower than that of control group, there was a significant difference in the variation range; regarded drought tolerance coefficient of root fresh weight and drought tolerance coefficient of dry weight on the ground as the comprehensive index could evaluate drought tolerance of maize inbred lines better than other indexes at seedling stage; the cluster analysis divided testing maize inbred lines into 5 levels of drought tolerance: 4 were extremely strong drought tolerance; 18 were strong drought tolerance; 25 were moderate drought tolerance; 22 were weak drought tolerance; 11 were extremely weak drought tolerance.
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