64份苦荞种质资源农艺性状遗传多样性分析与综合评价

采用Shannon-Wienerˊs多样性指数、主成分分析、综合得分F值及聚类分析等方法对干旱地区64份苦荞种质资源的主要农艺性状进行了遗传多样性分析和综合评价。结果表明,单株粒重的遗传多样性指数最高,为13.630,主茎粗的变异系数最高,为30.6%;主成分分析将苦荞种质的11个农艺性状降维为累计贡献率达87.580%的6个主成分;综合得分F值与生育期、株高、主茎节数、千粒重和单株粒重等具有极显著的相关性,可作为苦荞种质资源综合评价的主要指标;根据综合得分F值和聚类分析结果筛选出7份具有不同育种目标选择潜力的优良材料。

Genetic Diversity Analysis and Comprehensive Assessment of Agronomic Traits of 64 Tartary Buckwheat Germplasms

The Shannon-Wiener’s diversity index, principal component analysis, comprehensive score F-value, and cluster analysis were used to investigate the genetic diversity and comprehensive assessment of tartary buckwheat germplasm resources including 64 accessions through phenotypic analysis of agronomic traits in arid area. The main conclusions were as follows: the genetic diversity index of seed weight per plant was the highest (13.630), and the coefficient of variation of main stem diameter was the highest（30.6%）. The principal component analysis transformed 11 traits into six principal components that indicated the accumulation indices of 87.580%. The F-value was significantly correlated with growth period, plant height, number of main stem nodes, 1000-grain weight, and seed weight per plant, so it could be used as an evaluation index of tartary buckwheat germplasm resources. Seven accessions of buckwheat germplasm resources selected based on the comprehensive scores F-value and the results of cluster analysis could be used as excellent breeding parents with different target characters.