排列激活strigolactone和salicylate生物合成促进了叶子衰老的发生
Yexing Jing1, Ziyi Yang1, Zongju Yang2
1State Key Laboratory of Crop Gene Resources and Breeding, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
The New phytologist
|April 19, 2024
概括
阿拉比多普西斯SPX1/2蛋白质负面调节叶子衰老. 斯特里戈拉克顿 (SL) 积累和酸 (SA) 生物合成被顺序激活,控制了叶子的老化.
科学领域:
- 植物生物学 植物生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 叶子衰老是一个复杂的发育过程.
- 控制叶子衰老的精确信号通路在很大程度上仍未确定.
- 了解这些通路对于农业应用和植物生理学至关重要.
研究的目的:
- 为了阐明调节叶子衰老的关键信号通路在阿拉比多普西斯.
- 为了识别衰老信号级联中的分子参与者及其相互作用.
- 为了揭示strigolactones (SLs) 和酸 (SA) 在这个过程中的作用.
主要方法:
- 在Arabidopsis thaliana中进行遗传分析.
- 蛋白质与蛋白质相互作用的研究.
- 基因表达分析 (转录激活).
- 激素量化 (SLs 和 SA).
主要成果:
- 阿拉比多普西斯SPX1/2蛋白质作为叶子衰老的负调节者,在SL路径的下游.
- SL受体复合体 (AtD14和MAX2) 调解了SPX1/2.2的年龄相关降解.
- SLs的年龄依赖性积累通过SPL9/15转录因子对SL生物合成基因的转录激活而发生.
- SPX1/2与WRKY75亚分类转录因子相互作用,抑制它们的DNA结合活性并抑制SA生物合成.
- 这种机制关闭了年龄相关的SA积累,启动了叶子衰老.
结论:
- 在Arabidopsis中揭示了叶子衰老开始的新信号通路.
- 该途径涉及连续激活strigolactone和酸生物合成.
- SPX1/2蛋白质作为关键的负调节剂,集成荷尔蒙信号来控制衰老时间.
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