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Genetic diversity in Chinese modern wheat varieties revealed by microsatellite markers

文献类型： 外文期刊

作者： Hao Chenyang 1 ; Wang Lanfen 2 ; Zhang Xueyong 2 ; You Guangxia 2 ; Dong Yushen 2 ; Jia Jizeng 2 ; Liu Xu 3 ; Shang Xunwu;

作者机构： 1.Chinese Acad Agr Sci, Key Lab Crop Germplasm & Biotechnol, MOA, Inst Crop Sci, Beijing 100081, Peoples R China

2.Chinese Acad Agr Sci, Key Lab Crop Germplasm & Biotechnol, MOA, Inst Crop Sci, Beijing 100081, Peoples R China; Gansu Agr Univ, Agron Coll, Lanzhou 730070, Peoples R China

3.Chinese Acad Agr Sci, Key Lab Crop Germplasm &

关键词： wheat;microsatellite markers;genetic diversity

期刊名称：SCIENCE IN CHINA SERIES C-LIFE SCIENCES （ 影响因子：1.61； 五年影响因子：1.148 ）

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收录情况： SCI

摘要： Genetic diversity of 1680 modern varieties in Chinese candidate core collections was analyzed at 78 SSR loci by fluorescence detection system. A total of 1336 alleles were detected, of which 1253 alleles could be annotated into 71 loci. For these 71 loci, the alleles ranged from 4 to 44 with an average of 17.6, and the PIC values changed from 0.19 to 0.89 with an average of 0.69. (1) In the three genomes of wheat, the average genetic richness was B>A>D, and the genetic diversity indexes were B>D>A. (2) Among the seven homoeologous groups, the average genetic richness was 2=7>3>4>6>5>1, and the genetic diversity indexes were 7>3>2>4>6>5>1. As a whole, group 7 possessed the highest genetic diversity, while groups 1 and 5 were the lowest. (3) In the 21wheat chromosomes, 7A, 3B and 2D possessed much higher genetic diversity, while 2A, 1B, 4D, 5D and 1D were the lowest. (4) The highest average genetic diversity index existed in varieties bred in the 1950s, and then it declined continually. However, thechange tendency of genetic diversity among decades was not greatly sharp. This was further illustrated by changes of the average genetic distance between varieties. In the 1950s it was the largest (0.731). Since the 1960s, it has decreased gradually (0.711, 0.706, 0.696, 0.695). The genetic base of modern varieties is becoming narrower and narrower. This should be given enough attention by breeders and policy makers.

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