河北省太行山区实生核桃果实性状综合评价及优株筛选OA

Sixty walnut trees with specific traits from the Taihang Mountain area in Hebei Province were used as experimental materials.Diversity and correlation analysis were conducted on 16 phenotypic traits of walnut.The principal component analysis,cluster analysis,and fuzzy membership function methods were adopted to conduct a comprehensive evaluation of the superior walnut germplasm,with the goal of providing a scientific foundation for the innovation and breeding of walnut germplasm resources in the Taihang Mountain area.The results showed that the 16 quantitative traits of the 60 walnut resources exhibited highly significant variation levels,with variation coefficients ranging from 4.11％to 37.98％.The evaluation of walnut fruit traits indicators could be simplified into 5 principal components,with a cumulative variance contribution rate of 80.602％.With a Euclidean distance of 6,the 60 walnut germplasms were divided into four different clusters:Cluster 1 consisted of walnut germplasm resources with more average performance;Cluster 2 consisted of small walnuts with small dimensions and light weight;Cluster 3 consisted of walnuts with a large fruit shape index and elongated fruit shape;Cluster 4 consisted of walnuts with large dimensions,heavy nut weight,low fat content,and high total protein content.Based on the comprehensive scores of the elite walnut trees,outstanding individuals such as Laiyuan No.2,Shexian No.6,Laiyuan No.1,Shexian No.14,and Laiyuan No.4 were selected.In summary,the 60 walnut germplasm resources showed a large amount of genetic variation and high genetic diversity,which can be divided into four clusters,and five superior strains were selected.This can provide valuable references for the cultivation of walnuts in the Taihang Mountain area.