【摘要】 为了系统解析玉米种质资源的耐冷萌发特性差异，筛选优异耐低温种质资源，以52份玉米新材料为试验材料，分别测定5℃和25℃条件下玉米种子发芽率、发芽指数、平均发芽时间和发芽势及其性状相对值等8个耐冷性相关指标，并运用相关性分析、主成分分析、隶属函数赋值及聚类分析等，对玉米材料的耐冷性进行综合剖析与评估。结果表明，在参试的52份玉米材料中，耐冷萌发能力呈现出十分丰富的遗传变异情况。相关性分析表明，8个耐冷性相关性状间呈显著正相关；通过主成分分析将8个单项指标划分为3个综合指标，累计贡献率达到93.84%,基于耐冷性综合D值对52份玉米新材料进行聚类分析，将其划分为4个耐低温等级，其中，耐低温性强的有19份，较强的有19份，较弱的材料有11份，弱的材料有3份。更多还原

【Abstract】 In order to systematically analyze the differences in cold germination tolerance characteristics of maize germplasm resources and screen the excellent low temperature tolerance germplasm resources,52 new maize materials were used as experimental materials,and 12 indexes related to cold tolerance of maize seeds,such as germination rate,germination index,average germination time,germination potential and relative value of traits,were determined at 5℃ and 25℃ respectively.The cold resistance of maize materials was analyzed and evaluated comprehensively by using correlation analysis,principal component analysis,membership function analysis and cluster analysis.The results showed that the cold germination tolerance of 52 maize materials showed very rich genetic variation.Correlation analysis showed that there were significant positive correlations among the 8 cold tolerance traits.Principal component analysis divided 8 individual indicators into 3 independent comprehensive indicators,with a cumulative contribution rate of 93.84%.Based on the comprehensive D value of cold resistance,cluster analysis was conducted on 52 new maize materials,and they were divided into 4 low temperature resistance grades,among which 19 were the strongest,19 were strong,11 were weak and 3 were the weakest.This study provided the core parental selection basis for the innovation of cold tolerant germplasm and methodological reference for crop stress resistance evaluation.更多还原