Biotechnology Bulletin ›› 2020, Vol. 36 ›› Issue (12): 21-33.doi: 10.13560/j.cnki.biotech.bull.1985.2020-0344

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Genetic Relationship Analysis of Sorghum Breeding Materials Based on Simplified Genome Sequencing

ZHANG Yi-zhong1,2(), FAN Xin-qi1, YANG Hui-yong1, ZHANG Xiao-juan1, SHAO Qiang1, LIANG Du1, GUO Qi1, LIU Qing-shan1(), DU Wei-jun2()   

  1. 1. Sorghum Research Institute,Shanxi Agricultural university(Shanxi Academy of Agricultural Sciences)/Shanxi Key Laboratory of Sorghum Genetic and Germplasm Innovation,Yuci 030600
    2. College of Agriculture,Shanxi Agricultural University,Taigu 030801
  • Received:2020-03-25 Online:2020-12-26 Published:2020-12-22
  • Contact: LIU Qing-shan,DU Wei-jun E-mail:zhyzh225@163.com;673673@126.com;duweijun68@126.com

Abstract:

The objective of this study is to explore the genetic structure and relationship of sorghum breeding materials,and to provide theoretical basis for crossbreeding,germplasm innovation and heterosis group construction in the future. Specific-locus amplified fragment sequencing(SLAF-seq)was used to sequence 37 sorghum materials. The sorghum genome(Sorghum_bicolor_v3.1)was used as the reference genome for enzyme digestion prediction and the Nipponbare rice were as the control,and single nucleotide polymorphism(SNP)markers were developed and applied to genetic structure and genetic relationship analysis of breeding materials. Results showed that 106.19 Mb reads length data were obtained by sequencing from the 37 sorghum materials. The reads of the samples varied from 1 461 206 to 4 628 462. The paired-end mapped reads efficiency of the control data was 92.15%,the enzyme digestion efficiency was 89.69%,which indicated that SLAF database was normal. The average quality of sequencing Q30 was 89.60%,and the average GC content of all samples was 45.71%. A total of 226 724 SLAF tags were developed,of which 105 053 were polymorphic SLAF tags. A total 185 451 effective single nucleotide polymorphisms(SNPs)were obtained by sequence analysis. Based on these SNPs,37 sorghum breeding materials were divided into two groups by genetic structure analysis and principal component analysis. The maintenance lines and foreign materials were grouped into one,the restoration lines and Chinese materials were grouped into another one,and the grouping result was basically consistent with the actual genealogy. The genetic distance between materials was estimated based on SNP markers and the distance ranged from 0.0098 to 0.8841. The genetic distance between L2R and L17R was the smallest,and the genetic distance between 3765 white B and L17R was the largest. In this study,the blood relationship of some foreign materials was clarified. It was further found that the sterility lines of Durra and Kafir-caudatum were most distantly related to trend Kaoliang restoration lines,and more attentions should be paid to it in selecting parents for sorghum cross breeding.

Key words: sorghum, specific-locus amplified fragment sequencing, breeding materials, genetic structure, genetic relationship