ACTA AGRICULTURAE BOREALI-SINICA ›› 2019, Vol. 34 ›› Issue (1): 89-96. doi: 10.7668/hbnxb.201750672

Special Issue: Multigrain crops

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Association Analysis of SSR Markers and Photoperiod Sensitivity in Foxtail Millet

JIA Xiaoping1, ZHANG Bo1, LI Jianfeng1, YUAN Xilei1, LU Ping2, DAI Lingfeng1   

  1. 1. College of Agriculture, Henan University of Science and Technology, Luoyang 471003, China;
    2. Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2018-12-11 Published:2019-02-28

Abstract: Sensitivity to photoperiod is the main reason for narrow ecological adaptability and lacking cross-regional cultivars of foxtail millet. Identification of QTLs associated with millet photoperiod sensitivity is the foundation for further exploring genetic mechanisms of photoperiod sensitivity. 45 millet cultivars were surveyed for heading date in long-day region (Luoyang City, Henan Province) and short-day region (Ledong County, Hainan Province). The photoperiod sensitivity values of 45 millet cultivars were calculated according to the difference between the heading date in the two regions. Then, 40 pairs of SSR markers were used to determine the genotypes of these millet cultivars. Finally association analysis between SSR markers and photoperiod sensitivity was performed. The results showed that a total of 150 alleles were detected in 45 millet cultivars, giving an average allele number of 3.75 per locus. Of the 40 SSR markers, b200 and b124 amplified the most number of alleles (6 alleles per locus). Based on the SSR markers amplification data, the population genetic structure of 45 millet cultivars was analyzed, and the optimal K value was 3, so the 45 millet cultivars were divided into three subgroups. The first subgroup included 5 cultivars, the second subgroup included 16 cultivars and the third subgroup included 21 cultivars. The remaining three cultivars could not be grouped into any of the three subgroups, consisted of a mixed group. The linkage disequilibrium analysis showed that no significant linkage disequilibrium structures were found among 40 SSR markers. Finally association analysis between SSR markers and photoperiod sensitivity were performed, two loci, b200 (SSR8) and b127 (SSR35) were detected to associate with photoperiod sensitivity(P<0.05).

Key words: Millet, Photoperiod sensitivity, SSR markers, Association analysis

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Cite this article

JIA Xiaoping, ZHANG Bo, LI Jianfeng, YUAN Xilei, LU Ping, DAI Lingfeng. Association Analysis of SSR Markers and Photoperiod Sensitivity in Foxtail Millet[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(1): 89-96. doi: 10.7668/hbnxb.201750672.

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