Variation of Phenotypic Traits of Astragalus Polycladus in Different Habitats of the Sanjiangyuan District,China and its Response to Environmental Factors
The genetic characteristics of plants and the differences in external environmental conditions jointly determine the expression of plant functional traits.Plant functional traits can reflect the adaptation strategies of species to environmental conditions.The difference analysis,principal component analysis,correlation analysis and cluster analysis were carried out on the diversity of 19 phenotypic traits of 6 populations of Astragalus poly-cladus in Sanjiangyuan area by large sample sampling survey and statistical analysis.Difference analysis showed that phenotypic traits were different among different populations.The variation coefficient of 19 phenotypic traits was 0.51％～25.76％,among them inflorescence numbers,leaf order numbers,leaf shape index and seed num-bers have the largest variation coefficient,all exceeding 10％.Correlation analysis showed that there was no sig-nificant or extremely significant correlation between seed numbers,inflorescence numbers,seed shape index,root length,vegetative branch length and other traits,but there were correlations between other traits.There was a certain correlation between longitude,altitude and seed shape index.Soil conductivity was the most important environmental factor affecting the phenotypic traits of Astragalus polycladus.Three principal components were screened out by principal component analysis,and the cumulative contribution rate was 84.396％,indicating that these three principal components could reflect the most of the information of phenotypic traits of Astragalus polycladus.The cluster analysis showed that among the six populations,Henan,Yushu and Maqin populations were classified into one group with tall and large plants,,and Dari,Gande and Muli populations were classified into another group with low and dwarf plants..
Astragalus polycladusanalysis of variancecorrelation analysisphenotypic traitshabitat factor
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