Evaluation of Genetic Diversity of Sichuan Common Wheat Landraces in China by SSR Markers  

作　　者：LI Wei BIAN Chun-mei WEI Yu-ming LIU An-jun CHEN Guo-yue PU Zhi-en LIU Ya-xi ZHENG You-liang 

机构地区：[1]Key Laboratory of Crop Genetic Resources and Improvement in Southwest China,Ministry of Education,Sichuan Agricultural University [2]College of Agronomy,Sichuan Agricultural University [3]Triticeae Research Institute,Sichuan Agricultural University

出　　处：《Journal of Integrative Agriculture》2013年第9期1501-1511,共11页农业科学学报（英文版）

基　　金：supported by the National Basic Research Program of China (2011CB100100);the Program for Scientific Innovative Research Team in Sichuan, China(2011JTD0015 and 11TD005)

摘　　要：Genetic diversity of 62 Sichuan wheat landraces accessions of China was investigated by agronomic traits and SSR markers. The landrace population showed the characters of higher tiller capability and more kernels/spike, especially tiller no./plant of six accessions was over 40 and kernels/spike of three accessions was more than 70. A total of 547 alleles in 124 polymorphic loci were detected with an average of 4.76 alleles per locus by 114 SSR markers. Parameters analysis indicated that the genetic diversity ranked as genome A 〉 genome B 〉 genome D, and the homoeologous groups ranked as 5〉4〉3〉1〉2〉7〉6 based on genetic richness （Ri）. Furthermore, chromosomes 2A, 1B and 3D had more diversity than that of chromosomes 4A, 7A and 6B. The variation of SSR loci on chromosomes 1B, 2A, 2D, 3B, and 4B implied that, in the past, different selective pressures might have acted on different chromosome regions of these landraces. Our results suggested that Sichuan common wheat landraces is a useful genetic resource for genetic research and wheat improvement.Genetic diversity of 62 Sichuan wheat landraces accessions of China was investigated by agronomic traits and SSR markers. The landrace population showed the characters of higher tiller capability and more kernels/spike, especially tiller no./plant of six accessions was over 40 and kernels/spike of three accessions was more than 70. A total of 547 alleles in 124 polymorphic loci were detected with an average of 4.76 alleles per locus by 114 SSR markers. Parameters analysis indicated that the genetic diversity ranked as genome A 〉 genome B 〉 genome D, and the homoeologous groups ranked as 5〉4〉3〉1〉2〉7〉6 based on genetic richness （Ri）. Furthermore, chromosomes 2A, 1B and 3D had more diversity than that of chromosomes 4A, 7A and 6B. The variation of SSR loci on chromosomes 1B, 2A, 2D, 3B, and 4B implied that, in the past, different selective pressures might have acted on different chromosome regions of these landraces. Our results suggested that Sichuan common wheat landraces is a useful genetic resource for genetic research and wheat improvement.

关 键 词：genetic diversity SSR marker LANDRACES WHEAT 

分 类 号：S512.1[农业科学—作物学]