数字农科院2.0

甘蓝型油菜角果数突变体基因的定位及候选基因分析

文献类型: 中文期刊

关键词: 油菜; 角果数突变体; 花芽分化; BSA-seq; RNA-seq

期刊名称:作物学报

ISSN: 0496-3490

年卷期: 2021 年

页码:

收录情况: 北大核心(2020版) ; CSCD(2020-2021年度) ; 农林核心(2020版) ; 科技核心(2020版)

摘要: 角果数是油菜单株产量重要的构成因子之一, 其优异等位基因的发掘和利用对产量的提高至关重要。油菜中已定位到上百个角果数QTL, 但大多数效应不大且不稳定, 难以进行精细定位或克隆。本研究前期发掘到一个油菜突变体(No.7931), 其花序顶端在分化出约十朵花后即停止生长, 因而成熟期角果极少。利用该少角果突变体和多 角果品系No.73290 构建F2 分离群体, 从中挑选角果数极端单株各30 株进行BSA-seq, 在C02 染色体检测到3 个关联区间: 0~1.1 Mb、4.7~6.2 Mb、11.5~12.4 Mb。该候选区间在油菜参考基因组DarmorV8.1 中有522 个注释基因, 存在SNP 或Indel 差异且有同源注释的基因235 个。在花芽分化初期, 选取两亲本(No.73290 和No.7931)的茎尖分生组织进行RNA-seq, 总共鉴定到8958 个差异表达基因(DEGs)。这些DEGs 显著富集于20 个生物学通路, 包括碳代谢、翻译、氨基酸代谢(和花芽分化高度相关)等, 其中99 个位于关联区间。结合基因功能注释以及序列和表达差异分析确定了9 个候选基因(BnaC02g00490.1D2、BnaC02g01030.1D2、BnaC02g01120.1D2、BnaC02g00270.1D2、BnaC02g02670. 1D2、BnaC02g08680.1D2、BnaC02g08890.1D2、BnaC02g09480.1D2 和BnaC02g10490.1D2), 它们主要参与花序分生组织特性的维持和花器官的发育。上述研究结果为后续油菜角果数基因的精细定位和克隆奠定了坚实的基础。

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