为了解甘肃天水地区育成冬小麦品种的遗传多样性，提高种质资源的利用效率，以22份冬小麦品种为试验材料，研究了其主要农艺性状与品质性状的变异情况、遗传多样性指数，并进行了主成分分析和聚类分析。结果表明，农艺性状中，穗粒数的变异系数最大(11.5%)，千粒重的遗传多样性指数最高(1.75)；品质性状中，沉降值的变异系数最大(31.3%)，容重的遗传多样性指数最高(1.87)。说明供试材料的遗传多样性较丰富。8个性状的主成分分析结果表明，前4个主成分的累计贡献率为82.636%，用类平均法(UPGMA)将22个品种聚为5类，其中第Ⅰ类群可作为提高品质的材料供育种选择，第Ⅴ类群可作为增产材料供育种选择。

In order to understand the genetic diversity of winter wheat cultivars in Tianshui of Gansu， and to improve utilization efficiency of them， with 22 cultivars used as experimental materials，the study on the variation of main agronomic traits and quality traits， the genetic diversity index， principal components analysis and clustering analysis were conducted. The results showed that the variation coefficient of kernel number was the maximum(11.5%)， and genetic diversity index of thousand kernel weight was the highest (1.75%) in agronomic traits；the variation coefficient of sedimentation value was the maximum (31.3%) and genetic diversity index of volume-weight was the highest(1.87%) in quality traits. The principal components analysis of 8 traits showed that the accumulation indices of top 4 principal components was up to 82.636%， and the cluster analysis showed that 22 winter wheat varieties were classified into 5 groups， the quality in group 1 and the yield in group 5 were better and they could be used for wheat breeding.

S512.1

甘肃省自然科学基金(1610RJZE144)。