Diversity of Phenotypic Traits of Wild Astragalus polycladus Resource and Their Correlations with Environmental Factors in Sanjiangyuan Area
A total of 150 wild Astragalus polycladus plants from 6 cities(counties,towns)in Sanjiangyuan area were used as materials.The diversity,correlation and principal component analysis of 18 phenotypic traits were conducted,and their correlations with environmental factors were analyzed,so as to understand the phenotypic differentiation degree and population variation characteristics of Astragalus polycladus in Sanjiangyuan area,and provide basis for breeding excellent varieties of Astragalus polycladus.The results showed that the phenotypic traits of Astragalus polycladus resource had abundant diversity in Sanjiangyuan area,and the variation coefficient of 18 phenotypic traits was 1%—29%.Among them,the variation coefficients of stem diameter of reproductive branch and stem length of reproductive branch were higher(more than 20%),while the variation coefficients of calyx length and seed thickness were the smallest(1%).There were significant difference in phenotypic traits of Astragalus polycladus under different environments.Among them,the crown width from south to north,plant height,root number,stem length of reproductive branch,leaf thickness,corolla length,corolla number,seed thickness and seed longitudinal diameter of Astragalus polycladus in Muli Town were significantly lower than the other populations.Correlation analysis showed that there was significantly positive or negative correlation among phenotypic traits except for root number and stem length of reproductive branch.At the same time,the phenotypic traits of Astragalus polycladus were positively or negatively correlated with longitude,latitude,altitude and soil pH value,and different traits were affected by environmental factors differently.Among them,the corolla number,leaf thickness and root number were greatly affected.
Astragalus polycladusPhenotypic traitsDiversity analysisSanjiangyuan area
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