›› 2020, Vol. 32 ›› Issue (9): 1615-1625.DOI: 10.3969/j.issn.1004-1524.2020.09.10

• Horticultural Science • Previous Articles     Next Articles

Analysis of simple sequence repeats in transcriptome of garlic (Allium sativum L.) and development of molecular markers

LIU Xinyu1, TIAN Jie1,2,*   

  1. 1. Qinghai Key Laboratory of Vegetable Genetics and Physiology, Academy of Agriculture and Forestry Sciences, Qinghai University, Xining 810016, China;
    2. State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China
  • Received:2020-04-09 Online:2020-09-25 Published:2020-10-10

Abstract: In order to investigate features of SSR sequence and develop SSR primers of Allium sativum for garlic breeding, MISA software was used to detect the SSR loci and analyse the SSR information of the garlic transcriptome sequence in this study. The effectiveness and polymorphism of primers were determined by PCR amplification. The results showed that 444 865 unigenes were obtained from garlic transcriptome sequencing. A total of 141 132 SSR loci were identified, the occurrence frequency was 31.72%, the average distribution distance was 3.45 kb. The major repeat motifs were mononucleotide and dinucleotide, which accounted for 68.02% and 24.12%, respectively. 82 repeat motifs of SSR loci were identified, and the most abundant motifs were A/T and AT/AT,which accounted for 65.02% and 12.37%, respectively. A total of 125 616 pairs of SSR primers were designed by Primer 3.0, and 14 pairs of primers were randomly selected and amplified. There were 12 pairs of primers that were clearly amplified. Among them, 6 pairs showed rich polymorphism in 35 garlic germplasm. 26 polymorphic bands were obtained by using 6 pairs polymorphic primers, and the average polymorphic amplification band of each SSR primer was 4.33. According to the UPGMA analysis, 35 garlic germplasm resources were divided into 5 groups at the genetic similarity coefficient of 0.756 9. In conclusion, abundant SSR loci were obtained by development of SSR molecular markers in garlic transcriptome and SSR markers could be widely used.

Key words: Allium sativum L., transcriptome, simple sequence repeats, polymorphism

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