在高温压力下,HFR1对抗ABI4以协调细胞溶液氧化还原状态,以使种子在高温压力下发芽
Zhangcheng Wang1, Yan Mao1, Lei Liang1
1Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai, China.
Physiologia plantarum
|August 22, 2024
概括
高温通过增加活性氧物种 (ROS) 来抑制种子发芽. 这项研究表明,ABI4激活ROS的产生,而HFR1通常抑制ABI4,确保发芽. 在HT压力下降HFR1,释放ABI4并阻断发芽.
科学领域:
- 植物生物学 植物生物学
- 分子生物学分子生物学
- 压力生理学 压力生理学
背景情况:
- 种子发芽至关重要,受到光线,温度和像酸 (ABA) 这样的激素的调节.
- 高温 (HT) 通过增加活性氧物种 (ROS) 和ABA.抑制发芽.
- 以前的工作将HT与活性物种 (RNS) 和HFR1 S-化联系起来,抑制发芽.
研究的目的:
- 阐明高温抑制种子发芽的分子机制.
- 研究ABI4和HFR1在高温压力下调节活性氧物种 (ROS) 的作用.
主要方法:
- 对高温应激反应中的基因表达和蛋白质丰度的分析.
- 使用突变 (abi4) 和转基因植物过度表达ABI4.4.
- 研究HFR1和ABI4之间的蛋白质-蛋白质相互作用.
主要成果:
- 高温会增加ABI4蛋白水平,该蛋白调高RbohD (ROS产生) 并降低VTC2,抑制发芽.
- abi4突变种子对高温不敏感,呈现较低的ROS水平.
- 过度表达ABI4的转基因线条显示发芽减少和ROS增加.
- 通常情况下,HFR1会抑制ABI4,但高温会触发HFR1的降解,释放ABI4的活性,并促进ROS爆发.
结论:
- 在高温压力下,ABI4是ROS生产和种子发芽的关键调节者.
- 在正常条件下,HFR1作为ABI4的负调节剂,维持正常发芽的最佳ROS水平.
- HFR1-ABI4相互作用和随后的HFR1降解是控制在热应激下种子发芽的关键途径.
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