Evaluation of Genetic Diversity of Introduced Flax Germplasm from Abroad
Genetic diversity is an important part of biodiversity,and phenotypic variation is the ge-netic manifestation subject to environmental conditions and the main research content of genetic diversity. This study conducted multivariate statistical analysis on 8 phenotypic traits of 144 foreign-introduced flax germplasm resources in 3 different regions. The analysis results showed that the coefficient of variation of phenotypic traits in the 3 regions ranged from 0.053 to 0.356,with an average of 0.19. Among them,the variation degree of grain weight per plant was relatively large and the stability was poor,while the varia-tion degree of the total growth period was relatively small and the stability was good. The average genetic diversity coefficient was 1.37,among which the diversity index of fruit grain number was the largest (1.49),followed by process length (1.42),and the diversity index of plant height was the smallest (1.22). The results of the correlation analysis of 14 pairs of agronomic traits indicated that 7 pairs of traits showed extremely significant positive correlations,and 4 pairs of traits showed extremely significant negative correlations. The cluster analysis results showed that the 144 flax resources were divided into two major categories and five subcategories,which were consistent with the sources from five different foreign regions. The source of most of the varieties in Subcategory Ⅰ was Europe. The source of Subcategory Ⅱ was the United States,the source of Subcategory Ⅲ was Europe,the source of Subcategory Ⅳ was the A-mericas,and the source of Subcategory Ⅴ was Europe and the Americas.
万方数据
维普
