甘蓝型油菜株高性状的全基因组关联分析

Genome-wide Association Analysis of Plant Height in Rapeseed(Brassica napus)

适当的株高不仅是抗倒性和机械化收获的需要,而且是建立高产理想株型的需要。本研究测定来自世界油菜主产国的371份种质资源材料构成的自然群体的株高,利用60K SNP芯片对该群体进行基因型检测,获得了21 856个SNP,利用这些SNP和株高数据进行全基因组关联分析,结果表明:(1)检测到4个与株高显著关联的SNP,即Bn-A07-p3583161、Bn-scaff_22790_1-p1271170、Bn-scaff_20735_1-p42779和Bn-scaff_18702_1-p589589,分别分布于A07、C01和C02染色体;它们对表型变异的解释率分别为11.33%、11.75%、12.31%和10.97%;(2)参考基因组信息,在上述前3个SNP附近的492.0、9.5和69.5 kb处分别找到一个与株高性状相关的候选基因;(3)4个显著SNP各自的等位基因间表型均值差异分别为11.09、15.12、10.48和8.93 cm,双尾t测验结果表明各等位基因组间差异显著。

Appropriate plant height is a trait related to lodging resistance and mechanical harvest, and ideal plant height is a basis of ideotype for high yield. The plant height of 371 rapeseed accessions collected from different growing regions in the world was measured in field experiments, all accessions were genotyped using a 60 K SNP chip and 21856 informative SNPs were acquired, then the data of SNPs and plant height were used for genome-wide association analysis. Major results were as follows： 1） 4 significant SNPs related to plant height were detected, including Bn-A07-p3583161, Bn-scaff_22790_1-p1271170, Bn-scaff_ 20735_1-p42779, and Bn-scaff_18702_1-p589589, which located in A07, C01 and C02 chromosomes, and explained 11.33%, 11.75%, 12.31%, and 10.97% of phenotypic variation, respectively; 2） According to the reference genome annotation information, three candidate genes corresponding to the first three significant SNPs were predicted, each gene was located in 492.0, 9.5, and 69.5 kb away from the three SNPs, respectively; 3） The significant（two-tailed t-test） difference of plant height between means of two allelic groups of accessions corresponding to each significant SNP was 11.09, 15.12, 10.48, and 8.93 cm, respectively.