利用SNP芯片进行玉米遗传多样性和群体遗传结构分析及新品种选育

以瑞德群、兰卡斯特群、旅大红骨群、塘四平头群、PA、PB群、热带血缘群7个类群205份自交系为材料,利用6 973个高质量SNP标记,进行群体遗传结构、遗传多样性和类群间遗传关系分析.结果表明,205份材料可分为7个类群,主等位基因频率平均值为0.726,基因多样性为平均值为0.344,杂合度观测值平均值为0.274,...

Analysis on Maize Genetic Diversity and Population Genetic Structure by SNP Chip & Breeding of New Maize Varieties

Two hundred and five inbred lines from 7 groups, such as Reid group, Lancaster group, LRC group, SPT group, PA, PB group and Tropical group, were used as materials. 6 973 high quality SNP markers were used to analyze population genetic structure, genetic diversity, and genetic relationship between groups. The results showed that 205 samples could be divided into 7 groups, the average frequency of main alleles was 0.726, the average gene diversity was 0.344, and the average value of heterozygosity was 0.274. The average PIC value of 0.723. In the 6 973 SNP markers, 3 750 SNP marker gene diversity was 0.45-0.50, and 53.8% of the total, which had a high level of polymorphism. Through cluster division and selection of inbred lines with ideal plant type and excellent resistance in the field, hybrid combinations were prepared according to incomplete diallel crossing design, and a new maize variety Jidan563 was selected and approved.