虎耳草表型特征多样性分析OA北大核心CSTPCD

In order to better understand the intraspecific diversity of Saxifraga stolonifera and to explore the possibility of its classification,and to provide reference for the resource protection and innovative utilization of S.stolonifera germplasms,33 traits from 43 populations of S.stolonifera in China were investigated,and the diversity of phenotypic traits was analyzed by numerical trait variation analysis,qualitative trait genetic diversity analysis,correlation analysis,principal component analysis and cluster analysis.The results showed that:(l)The coefficient of variation of numerical traits was 0.05-0.67,and the diversity index of qualitative traits was 0.19-1.39,and the distribution pattern of maculation and leaf color diversity were high among populations,and the branch number and the ratio of leaf length to width of stolon were the most unstable and the most stable traits,respectively.(2)The coefficient of variation of numerical and derived traits,and the diversity index of quality traits were generally high,and the contribution rates of each principal component were relatively scattered,so it was unsuitable to classify the species into different taxa only by morphological traits.(3)There were differences in the correlation of different personality traits among populations of S.stolonifera,and significant correlations included leaf length and width,length of long lower petal and length of short lower petal,width of long lower petal and width of short lower petal,respectively.(4)Based on the results of morphological clustering,S.stolonifera in China could be divided into three branches,which exhibited certain regional character.Cluster Ⅰ was composed of eight Southwest populations,two East China populations,and three Northwest populations;Cluster Ⅱ consisted of four populations from East China,four populations from Central China,four populations from Southwest China,and one population from Northwest China,so Cluster Ⅱwas widely distributed;Cluster Ⅲ consisted of ten Central China populations,six Southwest populations,and one East China population.