甜高粱种质资源主要农艺性状的主成分及聚类分析

为了解甜高粱种质资源的多样性,充分挖掘利用其有益基因,提高甜高粱育种效率。本试验对15份甜高粱种质资源的7个农艺性状进行遗传变异、相关性、主成分及聚类分析。结果表明,7个农艺性状中锤度变异系数最大,为31.22%；茎粗变异系数最小,为7.73%。相关性分析结果显示,株高与茎粗呈极显著负相关,与穗粒重、千粒重呈弱负相关；锤度与其它6个性状相关性较弱。主成分分析结果表明,株型因子、籽粒产量因子、锤度因子累计贡献率达83.115%,可基本反映7个农艺性状的遗传信息。通过聚类分析将15份甜高粱种质资源分为4大类,各类群间农艺性状差异明显,其中第Ⅲ、第Ⅳ类群性状优良,可作为核心种质资源进一步挖掘利用。

Main Agronomic Characters of Sweet Sorghum Germplasm: Principal Component Analysis and Cluster Analysis

To understand the diversity of germplasm, explore beneficial genes and improve breeding efficiency of sweet sorghum, we carried out the genetic variation, correlation, principal component and cluster analysis of 7 agronomic characters of 15 sweet sorghum germplasm resources. The results showed that: the variation coefficient of brix was the largest (31.22%) and that of stem diameter was the smallest (7.73%) among the 7 agronomic characters; the correlation analysis showed that plant height was significantly and negatively correlated with stem diameter, and was negatively correlated with 1000-grain weight and weight of grains per panicle; the correlation between brix and the other 6 characters was weak; the principal component analysis showed that the cumulative contribution rate of the plant type factor, the grain yield factor and the bix factor was 83.115% , reflecting the genetic information of the 7 agronomic characters; the 15 sweet sorghum germplasm resources could be divided into 4 types with cluster analysis, the difference of agronomic characters among the 4 types was obvious; the Ⅲ and Ⅳ type with superior characters could be further excavated and utilized as a core germplasm resource.