关键词: 杂交稻, 杂交稻, 籽粒, 比重, 产量性状

Abstract: 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.