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Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (8): 199-210.DOI: 10.11686/cyxb2021234

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Development of SSR markers based on full-length transcriptome sequencing and genetic diversity analysis of Halogeton glomeratus

Lu-juan SUN1,2(), Jian-jun HE1,2, Jun-cheng WANG1,2, Li-rong YAO1,2, Er-jing SI1,2, Ke YANG1,2, Bao-chun LI1,3, Xiao-le MA1,2, Xun-wu SHANG2, Ya-xiong MENG1,2(), Hua-jun WANG1,2()   

  1. 1.State Key Laboratory of Aridland Crop Science,Gansu Agricultural University,Gansu Provincial Key Lab of Crop Improvement & Germplasm Enhancement,Lanzhou 730070,China
    2.College of Agronomy,Gansu Agricultural University,Lanzhou 730070,China
    3.College of Life Sciences and Technology,Gansu Agricultural University,Lanzhou 730070,China
  • Received:2021-06-17 Revised:2021-10-29 Online:2022-08-20 Published:2022-07-01
  • Contact: Ya-xiong MENG,Hua-jun WANG

Abstract:

In this study, we used MISA online software to search for SSR loci at the transcriptome level of Halogeton glomeratus based on the full-length transcriptome data of H. glomeratus. A total of 29640 SSR loci were identified. The frequency of each SSR locus was 4.93 kb. SSR types included one- to six-nucleotide repeats, with the number of repeats ranging from four to 20, of which the trinucleotide repeats were the highest, at 38.25% of the total. Tetranucleotide repeats were the least common, comprising only 3.26%. A total of 327 SSR repeat types were identified, the frequencies of A/T, AG/CT, ATC/GAT and AAG/CTT repeat types were much higher than others. Further, SSR markers were developed and the genetic diversity of H. glomeratus from 18 different ecological sites in Gansu was analyzed. From the available 29640 SSR markers, 218 pairs of markers were identified as candidates for polymorphism screening, and 33 pairs of markers with high polymorphism were screened. A total of 199 alleles were detected for these markers, with the number of alleles varying from three to 13 and an average of 6.03. The gene diversity index (GD) ranged from 0.583 to 0.869 with an average of 0.698; the number of genotypes (GN) ranged from two to 13 with an average of 5.88; the polymorphism information content value varied from 0.527 to 0.856 with an average of 0.623. Cluster analysis indicated that the genetic similarity coefficient (GS) of H. glomeratus ranged from 0.528 to 0.859 with an average of 0.683 for 18 different ecological sites in Gansu. At a GS of 0.68, the tested materials were divided into four categories. This study provides reference data for the development and utilization of H. glomeratus germplasm resources.

Key words: full-length transcriptome, SSR repeat types, polymorphism screening, cluster analysis