An assessment of the genetic diversity of pear(Pyrus L.)germplasm resources based on the fruit phenotypic traits  

作　　者：ZHANG Ying CAO Yu-fen HUO Hong-liang XU Jia-yu TIAN Lu-ming DONG Xing-guang QI Dan LIU Chao 

机构地区：[1]Research Institute of Pomology,Chinese Academy of Agricultural Sciences,Xingcheng 125100,P.R.China

出　　处：《Journal of Integrative Agriculture》2022年第8期2275-2290,共16页农业科学学报（英文版）

基　　金：supported by the China Agriculture Research System of MOF and MARA(CARS-29-01);the Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences(CAAS-ASTIP2016-RIP-01)。

摘　　要：Germplasm resources are an important basis for genetic breeding and analysis of complex traits,and research on genetic diversity is conducive to the exploration and creation of new types of germplasm.In this study,the distribution frequency,coefficient of variation,Shannon-Wiener index,and variance and cluster analyses were used to analyze the diversity and trait differences of 39 fruit phenotypic traits from 570 pear accessions,which included 456 pear accessions from 11 species and 114 interspecific hybrid cultivars that had been stored in the National Germplasm Repository of Apple and Pear(Xingcheng,China).The comprehensive evaluation indices were screened by correlation,principal component and regression analyses.A total of 132 variant types were detected in 28 categorical traits of pear germplasm fruit,which indicate a rich diversity.The diversity indices in decreasing order were:fruit shape(1.949),attitude of calyx(1.908),flesh texture type(1.700),persistency of calyx(1.681),russet location(1.658),relief of area around eye basin(1.644),flavor(1.610)and ground color(1.592).The coefficient of variation of titratable acidity in the 11 numerical traits of pear germplasm fruit was as high as 128.43%,which could more effectively reflect the differences between pear accessions.The phenotypic differentiation coefficient V_(st)(66.4%)among the five cultivated pear species,including Pyrus bretschneideri(White Pear),P.pyrifolia(Sand Pear),P.ussuriensis(Ussurian Pear),P.sinkiangensis(Xinjiang Pear),and P.communis(European Pear),was higher than the within population phenotypic differentiation coefficient V_(st)(33.6%).The variation among populations was the main source of variation in pear fruit traits.A hierarchical cluster analysis divided the 389 accessions of six cultivated pear species,including P.pashia(Himalayan Pear),into six categories.There were certain characteristics within the populations,and the differences between populations were not completely clustered by region.For example,Sand Pear cultivars from Japa

关 键 词：PEAR fruit phenotypic traits genetic diversity comprehensive evaluation 

分 类 号：S661.2[农业科学—果树学]