›› 2020, Vol. 32 ›› Issue (11): 1941-1953.DOI: 10.3969/j.issn.1004-1524.2020.11.03

• Crop Science • Previous Articles     Next Articles

Association analysis of four spike traits in barley

HU Qianwen1, XU Yanhao1, WANG Rong1, ZHANG Wenying1, HUA Wei2,*, LYU Chao3   

  1. 1. Hubei Key Laboratory of Waterlogging Disaster and Agriculture Use of Wetland, College of Agriculture, Yangtze University/Hubei Collaborative Innovation Centre for Grain Industry, Jingzhou 434000, China;
    2. Institute of Crop and Nuclear Technology Utilization, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China;
    3. Jiangsu Key Laboratory of Crop Genetics and Physiology, Agricultural College, Yangzhou University, Yangzhou 225009, China
  • Received:2019-05-30 Online:2020-11-25 Published:2020-12-02

Abstract: Spike traits are important determinants of barley yield and quality. A good spike structure should have a certain spike length, suitable spikelet density and spikelet number per spike. In this study, 137 barley materials from a wide range were used as the population for association analysis. A total of 224 pairs of SSR markers were used to analyze the genotype of the population. Under two environmental experiments, grain number per spike, spikelet density, spikelet number per spike and spike length were recorded. General linear model (GLM) and mixed linear model (MLM) models were used to analyze the association between four spike traits and SSR markers. The results showed that there were significant differences among the four spike traits of the tested barley population. Grain number per spike was significantly related to spikelet number per spike, and spike length was significantly related to spikelet density. A total of 479 alleles were detected for SSR markers. The average effective allele number, Shannon's index and PIC were 1.765, 0.612 and 0.327, respectively. The genetic similarity coefficient (GS) of the tested materials ranged from 0.486 to 0.891. The barley materials were divided into two groups at GS value level of 0.580. Population structure analysis also divided the materials into two subgroups. The results of GLM analysis showed that there were 33, 13, 34 and 6 loci associated with grain number per spike, spikelet density, spikelet number per spike and spike length, respectively, and the phenotypic variation explained by a single marker ranged from 8.65% to 50.08% (P<0.001). These markers were located on seven chromosomes of barley. The results of MLM analysis showed that there were 4, 3, 4 and 1 marker sites associated with the four spike traits described above, respectively. The phenotypic variation explained by a single marker ranged from 3.12% to 16.95% (P<0.001). These markers were located on the chromosome 1H, 2H and 4H of barley. The four markers Ind1003, Ind2030, Ind2055 and Ind4012, which associated to both grain number per spike and spikelet number per spike, could be detected by two models in two tests.

Key words: barley, SSR, spike trait, genetic diversity, association analysis

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