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玉米中由缺乏引起的根皮皮层空心病的遗传基础由GWAS和转录组分析揭示

Jianxin Yan¹, Wenqing Zhang¹, Qing Tian¹

¹Collage of Resources and Environment, Jilin Agricultural University, Changchun 130118, China.

Plants (Basel, Switzerland)

|January 10, 2026

概括

玉米中的吸收通过根皮层空气 (RCA) 的形成得到改善,这是一个受低 (LN) 压力影响的特征. 这项研究确定了控制RCA的关键基因,为培育更高效的玉米品种提供了资源.

科学领域:

植物遗传学和基因组学
植物生理学作物生理学
农业科学农业科学

背景情况:

(N) 对玉米 (Zea mays L.) 产量至关重要,但目前的品种具有有限的N吸收效率.
根皮层空气基因 (RCA) 的形成通过降低根代谢成本来增强土壤勘探和N的获取.
形成RCA的遗传基础,特别是在营养压力下,尚不清楚.

研究的目的:

在低 (LN) 压力下的玉米中剖析RCA形成的遗传结构.
识别与LN响应RCA特征相关的候选基因和遗传变异.
提供基因资源,用于标记器辅助的N-高效玉米的育种.

主要方法:

在LN压力下对295个玉米杂交线的RCA面积 (RCAA) 和比例 (RCAP) 的表型分析.
全基因组关联研究 (GWAS) 以确定重要的SNP和候选基因.
转录形状分析以识别差异表达的基因和用GWAS进行综合分析.

主要成果:

低应力显著诱导了RCA形成,在玉米种系中存在很大差异.
非硬茎 (NSS) 亚群在LN压力下显示出较高的RCAA,与硬茎亚群相比.
GWAS和转录组学确定了560个显著的SNP,810个候选基因,并确定了四个核心基因 (GRMZM2G033570,GRMZM2G052422,GRMZM2G080603,GRMZM2G472266) 参与乙烯信号和根部发育.
在NSS和热带/亚热带亚群中,三个基因的有利单元类型普遍存在.

结论:

这项研究阐明了玉米中低反应性RCA形成的遗传基础.
已识别的核心基因及其有利的单元型为培育N效率高的玉米提供了有价值的标.
这些发现为通过提高利用率来提高玉米生产率提供了基本资源.

关键词:

候选基因是指候选基因的基因.全基因组关联研究研究.这就是的酸.根部皮层的空气瘤.

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