30份苏丹草种质资源农艺性状的遗传多样性分析

Genetic diversity of agronomic characteristics of 30 Sorghum sudanense germplasm

对30份苏丹草(Sorghum sudanense)种质资源的19个性状进行了遗传多样性、主成分与聚类分析。结果表明,19个性状在不同材料之间表现出了不同程度的多样性,千粒重的广义遗传力最高,为90.93%,穗一级枝梗长、穗粒重、茎粗等7个性状的广义遗传力在40%~70%,其他的性状广义遗传力相对较低,都在30%以下;主成分分析表明,前3个主成分对变异的累计贡献率为84.32%,第1主成分反映产量,第2主成分反映生育期,第3主成分反映叶型;聚类分析将其划分为四大类群,类群Ⅰ为早熟、矮秆、细叶、短穗松散、多分蘖型,类群Ⅱ为晚熟、高秆、宽叶、短穗紧密、多分蘖型,类群Ⅲ为适熟、中秆、宽叶、长穗松散、中等分蘖型,类群Ⅳ为晚熟、高秆、宽叶、长穗松散、少分蘖型。

The genetic diversity of 30 Sorghum sudanense accessions were conducted with 19 agronomic traits by principal component and clustering analysis.The results showed that the different accessions exhibited various degree of diversity for these available 19 traits in which generalized heritability of thousand seed weights was the highest with 90.93%.The generalized heritability of ear level rachis length,stem diameter and other 5 traits were 40%~ 70% whereas that of all of the others were below 30%.Principal component analysis showed that the cumulative proportion of former 3 principal components reached 84.32% with the yield as the first component,growth period as the second component and leaf type as the third component.The 30 S.sudanense accessions were divided into 4groups.The group Ⅰ was early matyurity with short stem,small leaves,short-loose spikes and multi-tillers.The group Ⅱ was high stem,broad leaves,short-close spikes,multi-tillers with long growing duration.The group Ⅲwas proper maturity,with medium stem,broad leaves,long-loose spikes,medium-tillers.The group Ⅳ was similar with the second group but with long-loose spike and fewer-tillers.