当地信号诱导干旱压力下的口腔关闭
Akie Shimotohno1,2, Yoshikatsu Matsubayashi3, Yujuan Du4
1Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Aichi, Japan. ashimo@itbm.nagoya-u.ac.jp.
Nature communications
|December 24, 2025
概括
植物使用信号 (CLE5p) 在干旱期间快速关闭胃口,绕过了对酸 (ABA) 或活性氧物种 (ROS) 的需求. 这一发现揭示了植物保存的干旱生存机制.
科学领域:
- 植物生物学 植物生物学
- 分子植物生理学分子植物生理学
- 植物应激反应应激反应
背景情况:
- 植物在干旱期间关闭口腔以节约水,这一过程与酸 (ABA) 积累有关.
- 在压力下协调快速口腔关闭和延迟ABA积累的分子机制尚未完全理解.
研究的目的:
- 阐明了在Arabidopsis thaliana的干旱压力的快速口腔关闭反应背后的分子机制.
- 为了识别调节口腔运动的信号元件,独立于ABA生物合成.
主要方法:
- 已经研究了Arabidopsis thaliana对CLAVATA3/ENDOSPERM SURROUNDING REGION 5 (CLE5) 的功能丧失突变.
- 描述了CLE5 (CLE5p) 的作用及其与护卫细胞中的BAM1-GHR1受体复合物的相互作用.
- 通过BAM1-GHR1-CLE5p模块分析了SNF1相关蛋白激酶 (SRK2E和SRK2D) 的酸化.
主要成果:
- 在CLE5突变中,干旱耐受性降低.
- 通过激活护卫细胞中的BAM1-GHR1受体复合体,CLE5p直接诱导口腔关闭.
- BAM1-GHR1-CLE5p模块酸化SRK2E和SRK2D,调节口腔运动和基因表达,而不会增加ABA或ROS.
结论:
- 涉及CLE5p,BAM1-GHR1和SRK2激酶的新型信号通路使得快速的,ABA独立的口腔关闭成为可能.
- 这种酸媒介的快速口腔关闭是一种保存的植物生存策略,在开发抗干旱作物方面具有潜在的应用.
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