作物学报 ›› 2021, Vol. 47 ›› Issue (4): 650-659.doi: 10.3724/SP.J.1006.2021.04136
张春1,2(
), 赵小珍1,2, 庞承珂1,2, 彭门路1,2, 王晓东2, 陈锋2, 张维2, 陈松2, 彭琦2, 易斌3, 孙程明2,3,*(
), 张洁夫2,*(
), 傅廷栋3
ZHANG Chun1,2(
), ZHAO Xiao-Zhen1,2, PANG Cheng-Ke1,2, PENG Men-Lu1,2, WANG Xiao-Dong2, CHEN Feng2, ZHANG Wei2, CHEN Song2, PENG Qi2, YI Bin3, SUN Cheng-Ming2,3,*(
), ZHANG Jie-Fu2,*(
), FU Ting-Dong3
摘要:
千粒重是油菜产量构成的重要因素之一。本研究利用高通量SNP芯片对496份具有代表性的油菜种质资源进行基因型分析, 考察群体在3个环境(14NJ、15TZ、16TZ)中的千粒重表型, 利用混合线性模型(mixed linear model, MLM)和一般线性模型(general linear model, GLM)进行全基因组关联分析。结果表明, 本群体在3个环境中千粒重的广义遗传力为63.12%。MLM模型检测到6个显著位点, 解释28.92%的表型变异; GLM模型检测到61个显著位点, 解释47.08%的表型变异。合并共同位点后得到62个显著位点, 联合解释47.31%的表型变异。这些位点分布在基因组所有染色体上, 在A07、A03和C06染色体上分别检测到数目最多的9、8和7个位点。其中效应最大的位点Bn-scaff_17526_1-p1066214位于C09染色体, 在MLM和GLM模型中表型贡献值分别为5.55%和15.26%。21个位点与前人报道的QTL重叠, 其中8个位点得到至少2个群体的验证。其余41个位点为新鉴定的位点, 其中多个位点效应高且在多环境中被检测到, 如位点Bn-A03-p560769、Bn-scaff_15743_1-p599416和Bn-scaff_15743_1-p590955等。在11个位点附近找到DGAT、EOD3、AGL61、WRI1、DA2、RAV1等拟南芥已报道千粒重基因的同源基因。本研究结果有助于解析甘蓝型油菜千粒重的遗传基础, 为研究千粒重的调控机制、指导千粒重的遗传改良奠定基础。
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