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《Molecular Plant Breeding》 2018-10
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Genetic Diversity Analysis of Phenotypic Traits in 7 Species of Cymbidium

Fu Qiaojuan;Li Chunnan;Zhao Fukang;Sun Yao;Hangzhou Academy of Agricultural Sciences;  
In order to understand the relationship among Cymbidium germplasms and improve the use efficiency of Cymbidium, genetic variation analysis, principal component analysis and cluster analysis were conducted on 43 phenotypic traits of 280 Cymbidium individuals belonging to 7 Cymbidium germplasm. The results showed that the phenotypic diversity of Cymbidium germplasms was rich and the variation of quantitative characters was high. The interspecific average variation coefficient(CV) ranged from 13.17% to 38.89%, and the highest value of CV was detected in C. goeringii, in which the variation coefficient of each character was higher than 20%. The interspecific average Shannon-Weaver indexes(I) ranged from 0.10 to 1.69, among which the lowest value presented in tepal number, and the highest value presented in main color of flower and petal. The highest value of Shannon-Weaver indexes within species was detected in C. hybridum, followed by C. goeringii, and the lowest was in C. sinense.Among all germplasms, most accessions had spots but no stripes on the lip, while most sepals had no spots. Four principal components were screened using PCA based on the variance cumulative contribution rate of 89.407%,which could reflect the integral phenotype of 7 species of Cymbidium. Based on cluster analysis, all the accessions were classified into two major groups at the 3.73 level(Chi-square distance): the first category included C. hybridum and hybrid Cymbidium, and the second category included other 5 species. The shortest genetic distance was between C. goeringii and C. faberi, followed by the one between hybrid Cymbidium and C. hybridum.This experimentcould provide a theoretical basis for the study of the genetic relationship among C. hybridum germplasms.
【Fund】: 杭州市科技计划项目(20150432B07);; 杭州市农业科研主动设计项目(20172015A04)共同资助
【CateGory Index】: S682.31
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