利用单引物富集技术(SPET)研究埃及兵豆的分子遗传多样性和连锁不平衡结构。
Molecular genetic diversity and linkage disequilibrium structure of the Egyptian faba bean using Single Primer Enrichment Technology (SPET).
机构信息
Genebank Department, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Stadt Seeland, Germany.
Department of Genetics, Faculty of Agriculture, Assiut University, Assiut, 71526, Egypt.
出版信息
BMC Genomics. 2024 Jun 28;25(1):644. doi: 10.1186/s12864-024-10245-x.
Faba bean is an important legume crop. The genetic diversity among faba bean genotypes is very important for the genetic improvement of target traits. A set of 128 fab bean genotypes that are originally from Egypt were used in this study to investigate the genetic diversity and population structure. The 128 genotypes were genotyped using the Single Primer Enrichment Technology (SPET) by which a set of 6759 SNP markers were generated after filtration. The SNP markers were distributed on all chromosomes with a range extending from 822 (Chr. 6) to 1872 (Chr.1). The SNP markers had wide ranges of polymorphic information content (PIC), gene diversity (GD), and minor allele frequency. The analysis of population structure divided the Egyptian faba bean population into five subpopulations. Considerable genetic distance was found among all genotypes, ranging from 0.1 to 0.4. The highly divergent genotype was highlighted in this study and the genetic distance among genotypes ranged from 0.1 and 0.6. Moreover, the structure of linkage disequilibrium was studied, and the analysis revealed a low level of LD in the Egyptian faba bean population. A slow LD decay at the genomic and chromosomal levels was observed. Interestingly, the distribution of haplotype blocks was presented in each chromosome and the number of haplotype block ranged from 65 (Chr. 4) to 156 (Chr. 1). Migration and genetic drift are the main reasons for the low LD in the Egyptian faba bean population. The results of this study shed light on the possibility of the genetic improvement of faba bean crop in Egypt and conducting genetic association analyses to identify candidate genes associated with target traits (e.g. protein content, grain yield, etc.) in this panel.
蚕豆是一种重要的豆类作物。蚕豆基因型之间的遗传多样性对于目标性状的遗传改良非常重要。本研究使用了一组来自埃及的 128 个蚕豆基因型,以研究遗传多样性和群体结构。这 128 个基因型通过单引物富集技术 (SPET) 进行基因分型,经过筛选后产生了一组 6759 个 SNP 标记。 SNP 标记分布在所有染色体上,范围从 822(Chr.6)到 1872(Chr.1)。SNP 标记具有广泛的多态信息含量 (PIC)、基因多样性 (GD) 和小等位基因频率。群体结构分析将埃及蚕豆群体分为五个亚群。所有基因型之间存在相当大的遗传距离,范围从 0.1 到 0.4。本研究突出了高度分化的基因型,基因型之间的遗传距离范围从 0.1 到 0.6。此外,还研究了连锁不平衡的结构,分析表明埃及蚕豆群体的 LD 水平较低。在基因组和染色体水平上观察到 LD 衰减缓慢。有趣的是,每个染色体上都呈现了单倍型块的分布,单倍型块的数量从 65(Chr.4)到 156(Chr.1)不等。迁移和遗传漂变是埃及蚕豆群体 LD 低的主要原因。本研究的结果为埃及蚕豆作物的遗传改良提供了可能性,并进行了遗传关联分析,以鉴定与目标性状(如蛋白质含量、籽粒产量等)相关的候选基因。