花期对低和高的U形反应通过大米中的转录反循环
Shunan Zhang1,2, Guanzhong Shou1,2, Xianping Li1,2
1National Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Nanjing, Jiangsu, 211800, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|December 7, 2025
概括
的可用性通过U形曲线影响米花的开花时间. 一个新的Nhd1-Ghd7监管模块解释了这种反应,为培育N-弹性大米提供了目标.
科学领域:
- 植物生物学 植物生物学
- 遗传学 遗传学 是一个
- 农业科学 农业科学
背景情况:
- (N) 的可用性极大地影响了大米的开花时间 (标题日期),呈现出 U 形反应,其中 N 缺乏和过剩都会延迟开花.
- 这种N-依赖性可塑性影响作物生产率,使用效率和农业实践,但根本的遗传机制尚未完全理解.
研究的目的:
- 阐明控制米中气可用性的U形花开反应的分子机制.
- 识别关键的遗传调节者及其相互作用,控制开花时间的可塑性.
主要方法:
- 在N介导的标题日期1 (Nhd1) 和Ghd7转录因子之间的相互反循环分析.
- 遗传和分子证据,包括对标题日期3a (Hd3a) 的分析.
- 在米化过程中对Nhd1和Ghd7等位基因的自然变异分析.
主要成果:
- 在长日条件下,Nhd1和Ghd7之间的相互反循环协调了U形花朵对的反应.
- 缺乏的N延迟了Ghd7抑制Nhd1的开花;高的N延迟了Ghd7通过谷氨酸激活Nhd1的开花.
- 与Hd3a一起的Nhd1-Ghd7模块对于这种U形反应至关重要,Nhd1/Ghd7等位基因的自然变异与土壤N沉积模式相关.
结论:
- 该研究发现了一种新型的Nhd1-Ghd7调节模块,可以控制介导的水花期可塑性.
- 了解这个模块为N-弹性提供了机制性的洞察力,并为改良品种的育种提供了目标.
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