一种线粒体pentatricopeptide重复蛋白通过调节米饭中的线粒体超氧化物来增强耐寒性
Xiaofeng Zu1, Lilan Luo2, Zhen Wang1
1State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.
Nature communications
|October 25, 2023
概括
线粒体超氧化物调节大米的寒冷耐受性. 通过向线粒体基因表达来抑制塑功能缺陷,拯救了对寒冷敏感的白化米,提高了整体植物的弹性.
科学领域:
- 植物生物学 植物生物学
- 分子遗传学 分子遗传学
- 压力生理学 压力生理学
背景情况:
- 寒冷压力严重影响大米 (Oryza sativa) 的生长和产量.
- 塑类伪尿素合成酶 (OsPUS1) 的缺陷导致低温敏感性,导致白化种子和反应性氧物种 (ROS) 的积累.
研究的目的:
- 确定OsPUS1缺陷的抑制剂,并阐明大米耐寒性机制.
- 研究线粒体功能在缓解寒冷应激反应中的作用.
主要方法:
- 基因查以确定大米中的抑制突变.
- 分析线粒体基因表达,RNA拼接和RNA编辑.
- 在突变和转基因大米系中评估反应性氧物种 (ROS) 水平和表型.
- 在具有突变SOP10的印加大米品种中评估耐寒性.
主要成果:
- 确定了一种ospus1-1,sop10的抑制剂,它编码了一种线粒体局部化的蛋白质.
- SOP10突变损害了线粒体nad4和nad5的内子拼接,并减少了nad2,nad6和rps4转录的RNA编辑.
- 这些缺陷导致线粒体复合体I缺乏,减少ROS生成,以及在ospus1-1突变体中拯救白色表型.
- 过度表达超氧化物脱酶 (SOD) 基因,特别是Mn-SOD,部分挽救了ospus1-1表型.
- 通过降低ROS水平,SOP10突变提高了印加大米的寒冷耐受性.
结论:
- 线粒体功能,特别是复合I活性和ROS恒常性,对于大米耐寒性至关重要.
- SOP10在线粒体对寒冷压力的反应中起到关键的调节作用.
- 针对线粒体超氧化物调节提供了一个有前途的策略,以改善大米的耐寒性.
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