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Acta Agron Sin ›› 2016, Vol. 42 ›› Issue (02): 180-189.doi: 10.3724/SP.J.1006.2016.00180

• CROP GENETICS & BREEDING · GERMPLASM RESOURCES · MOLECULAR GENETICS • Previous Articles     Next Articles

Genetic Diversity and Association Analysis of Agronomic Characteristics with SSR Markers in Hulless Barley

MENG Ya-Xiong1,2,MENG Yi-Lin1,2,WANG Jun-Cheng1,2,SI Er-Jing1,2,ZHANG Hai-Juan1,2,REN Pan-Rong1,2,MA Xiao-Le1,2,LI Bao-Chun1,3,YANG Ke1,2,WANG Hua-Jun1,2,*   

  1. 1 Gansu Provincial Key Laboratory of Aridland Crop Science / Gansu Key Laboratory of Crop Improvement & Germplasm Enhancement, Lanzhou 730070, China; 2College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China; 3College of Life Sciences and Technology, Gansu Agricultural University, Lanzhou 730070, China
  • Received:2015-07-03 Revised:2015-11-20 Online:2016-02-12 Published:2015-12-07
  • Contact: 王化俊, E-mail: whuajun@yahoo.com, Tel: 13809315256 E-mail:yxmeng1@163.com
  • Supported by:

    This study was supported by the National Natural Science Foundation of China (31460347), Gansu Provincial Department of Finance Research Operating Expenses (035-041047), and the Special Program of Modern Agro-industry Technology System (CARS-05).

Abstract:

The objectives of this study were to find molecular markers associated with yield-related traits and guide parental combination in molecular marker-assisted breeding and hybrid breeding of hulless barley (Hordeum vulgare L. var. nudum HK. f.). A natural hulless barley population composed of 108 parental varieties/lines was screened with 92 SSR markers, in which 48 markers were polymorphic. Population structure was analyzed based on the polymorphic SSR data and association between markers and five agronomic traits were performed in TASSEL GLM (general linear model) and MLM (mixed linear model) programs. A total of 156 alleles were detected in the 108 varieties/lines with 2–6 alleles per locus. The Shannon’s index of the population ranged from 0.6727 to 1.1368 and the genetic similarity between varieties ranged from 0.2250 to 1.0000, with the mean of 0.7585. Structure analysis revealed four genetic subpopulations for the entire materials tested. Based on GLM analysis, 12 SSR markers were found to be associated with plant height, spike length, grain number per spike and tiller number, with phenotypic contributions of 11.5%–17.6%, 19.4%–45.4%, 15.4%–22.1% and 29.2%, respectively. Based on MLM analysis, 8 SSR markers were associated with plant height, awn length, and spikelet compactness, with the phenotypic contributions of 31.71%–49.88%, 28.1%–37.2%, and 22.7%–32.7%, respectively. These associated markers were distributed on 6 chromosomes of the barley genome.

Key words: Hulless barley, SSR, Genetic diversity, Population structure, Association analysis

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