在玉米中通过多亲种群识别耳朵直径的候选QTL和基因
Fuyan Jiang1, Li Liu1, Ziwei Li2
1Institute of Food Crops, Yunnan Academy of Agricultural Sciences, Kunming 650205, China.
Genes
|June 28, 2023
概括
研究人员绘制了定量特征位点 (QTL) 的地图,并确定了与玉米耳径 (ED) 相关的SNP. 一个合成酶基因,Zm00001d030559,与ED增加有关,为改善玉米谷物产量提供了见解.
科学领域:
- 植物遗传学 植物遗传学
- 农作物科学 农作物科学
- 玉米育种 玉米育种 玉米育种
背景情况:
- 耳径 (ED) 是玉米 (Zea mays L.) 谷物产量 (GY) 的关键决定因素.
- 了解ED的遗传基础对于增强玉米GY至关重要.
- 以前的研究集中在确定影响玉米耳朵发育的遗传因素上.
研究的目的:
- 绘制与玉米耳径 (ED) 相关的定量特征位置 (QTL) 和单核酸多态 (SNP).
- 为了确定在玉米中调节ED的潜在功能基因.
- 为标记器辅助育种提供遗传资源,以改善玉米GY.
主要方法:
- 构建一个包含1215个F7重组杂交系 (F7RILs) 的多父母种群,由涉及精英杂交系Ye107和其他七个精英系的交叉组成.
- 全基因组关联研究 (GWAS) 和链接分析利用264,694个高质量的SNP通过基因型测序生成.
- 对候选基因的哈普洛型分析,以评估它们与ED的相关性.
主要成果:
- 通过GWAS确定了11个与ED相关的显著SNP.
- 通过链接分析检测ED的三个QTL,其中一个主要的QTL位于染色体1上.
- 确定SNP_143985532,在Zm00001d030559基因 (编码胆合成酶) 的上游,作为与ED积极相关的关键遗传因素.
结论:
- 已识别的SNP和候选基因Zm00001d030559为玉米ED背后的遗传机制提供了重要的见解.
- 这些发现对未来的基因克隆工作和玉米ED的遗传改进有价值.
- 这项研究提供了必要的遗传资源,通过标记器辅助育种策略来提高玉米产量.
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