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玉米5号染色体上的定量特征位置与根结螺母虫抗性有关

Richard F Davis¹, Karen Harris-Shultz¹, Joseph E Knoll¹

¹U.S. Department of Agriculture-Agricultural Research Service, Crop Genetics and Breeding Research Unit, Tifton, GA.

|March 1, 2024

概括

研究人员确定了玉米中第一个南方根结线虫 (SRKN) 耐药性的定量特征位置 (QTL). 这一发现可能会导致开发抗虫感染的玉米杂交物,并防止作物产量损失.

科学领域:

遗传学是一个遗传学.
植物病理学植物病理学
农业学是一种农业学.

背景情况:

南方根结线虫 (SRKN) 在美国南部沿海平原造成玉米 (Zea mays) 显著的产量损失.
增加SRKN土壤密度会对后续易受影响的作物产生负面影响.
此前还没有确定过赋予玉米对SRKN耐药性的特定遗传区域.

研究的目的:

报告玉米中SRKN耐药性的第一个定量特征位置 (QTL).
为了确定与玉米宿主抗 SRKN.相关的遗传区域.
为开发耐SRKN的玉米杂交品种提供基础.

主要方法:

现型为B73 (易受感染) × Ky21 (耐药) S5重组杂交线 (RIL) 种群,总卵数 (TE) 和根重.
使用单核酸多态 (SNP) 基因型化RIL群体.
利用SNP和表型数据来识别与SRKN耐药性相关的QTL.

主要成果:

在5号染色体上确定了SRKN耐药性的单个QTL.
这种QTL解释了15%的表型变化 (PV) 对于总蛋 (TE) 和11%的PV对于每克根 (EGR) 的蛋.
与B73等位基因 (敏感) 的植物相比,具有Ky21等位基因 (耐药) 的植物表现出明显较少的卵和EGR.

结论:

在玉米中首个赋予SRKN耐药性的QTL已成功确定.
这种5号染色体上的QTL代表了培育SRKN耐药玉米的宝贵遗传资源.
将这种QTL纳入玉米杂交品种可以减轻SRKN相关的产量损失,并管理线虫种群.

关键词:

梅洛伊多基尼隐形的身份.齐亚梅斯 (Zea mays) 是一种植物.复合区间映射的复合区间映射玉米玉米玉米玉米玉米嵌套的协会绘制人口的地图.

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