【摘要】 为了给小麦抗旱育种的亲本选配提供理论依据,应用Shannon-weaver多样性指数和非加权配对算术平均聚类法(UPGMA)分析了42份冬小麦抗旱种质资源在6个农艺性状及4个抗旱生理指标(灌浆前期、中期、后期冠层温度和水分利用效率)水平上的遗传多样性,同时进行了聚类分析。结果表明,冬小麦灌浆前期和后期冠层温度、小穗数和产量的多样性指数较大,分别为1.96、2.03、2.01、1.94;灌浆前期冠层温度、水分利用效率、小穗数、穗粒数和产量的变异系数较大,分别为13.18%、11.55%、11.87%、11.43%和10.96%;供试材料可分为6个类群,国外材料间的欧氏遗传距离(4.46)大于国内材料间的欧氏遗传距离(3.66)。更多还原

【Abstract】 Data of 42 winter wheat with drought-resistance,were analyzed to study the genetic diversity of winter wheat germplasm resources in six agronomic traits and four physiological indicators relative to drought-resistance,using Weaver-shannon diversity index and non-matching weighted arithmetic mean clustering method(UPGMA) for supplying information on selection of male and female parents in drought resistance and water-saving breeding.Preliminary results showed that the diversity index of canopy temperature in early grain filling and late grain filling stage,the number of spikelet and yield were relatively large;variant coefficient of canopy temperature in early-filling stage,water use efficiency,the number of spikelet and seeds per spike,and the output of grain is comparatively large.Genetic distance between varieties was calculated using DPS data analysis software.The systematic cluster analysis of genetic distance showed that 42 experimental materials could be divided into six groups.The mean Euclidean genetic distance between foreign materials(4.46) was larger than that between domestic materials(3.66).Therefore,foreign winter wheat germplasm resources with drought resistance should be introduced actively and used fully to broaden genetic base for drought resistance and water-saving breeding of winter wheat and to improve breeding efficiency.更多还原