Genetic Diversity Analysis of Chinese Cherry Landraces (Prunus pseudocerasus) Based on Phenotypic Traits
Nested variance and cluster analysis were performed to assess the phenotypic diversity of 80 Chinese cherry landraces (Prunus pseudocerasus Lindl.) from seven distribution regions.A total of 26 morphological traits including leaf,fruit and stone phenotype were applied in this study.The results showed:(1) Significant differences were detected among 12 qualitative characters,with Shannon-Wiener indexes ranged from 0.61 to 1.64.The genetic traits with high diversity also displayed in fruit shape peel color,leaf shape and stone lateral shape.(2) For 14 quantitative traits,significant variance was detected both among and within populations.The average variation coefficient (CV) among quantitative traits is 9.93%,with the highest value 24.80% in carpopodium length,and the lowest in apical view index (6.61%).Among 7 distribution regions,the highest value of CVwas detected in Yunnan (12.92%),and lowest in Anhui (7.42%).(3) Five principal components with the variance cumulative contribution rate of 80.9434% were obtained based on the principal component analysis,which could account for the majority variation of the traits.(4) Based on Nei's genetic distance cluster analysis and principal coordinate analysis (PCoA),all the 80 accessions were classified into two major clusters.The accessions from Shandong,Henan and Anhui province classified as a cluster,and the individuals from Sichuan,Yunnan,Guizhou and Chongqing formed another one.This result indicates that Chinese cherry landraces in different geographic regions exhibit difference of phenotypic diversity,and this might be caused by various domestication processes from different geographic sites.
Chinese cherrygenetic diversitylandracephenotypic trait