自受体OsNBR1调节大米中的盐应激耐受性
Ao Ma1, Nan Nan2, Yuejie Shi1
1Key Laboratory of Molecular Epigenetics of the Ministry of Education (MOE), Northeast Normal University, Changchun, 130024, China.
Plant cell reports
|December 25, 2023
概括
自受体OsNBR1通过调节活性氧物种 (ROS) 积累,提高了米中的盐耐受性. 功能丧失突变增加了灵敏度,而过度表达提高了抵抗力.
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:
- 自受体,如NBR1 (在BRCA1基因1旁边),在细胞过程中至关重要.
- 虽然NBR1在非生物压力下的功能已知在Arabidopsis thaliana中,但它们在盐压力下的米中 (*Oryza sativa*) 的作用在很大程度上没有被描述.
研究的目的:
- 研究自受体OsNBR1在米盐应激耐受性中的作用.
- 阐明OsNBR1影响植物对盐度的反应的分子机制.
主要方法:
- 用激活标记的线进行选,以识别对盐敏感的突变物.
- 使用热不对称交错PCR (TAIL-PCR) 进行基因鉴定.
- 产生OsNBR1功能丧失突变体和过度表达线 (OsNBR1OE).
- 测量活性氧物种 (ROS) 积累和通过RNA-seq.分析基因表达.
主要成果:
- OsNBR1 (在AC10系) 的功能丧失突变导致盐敏感性增加.
- 过度表达的OsNBR1赋予了增强的耐盐性.
- OsNBR1突变呈现出更高的ROS产量,而OsNBR1OE系则显示出更低的ROS水平.
- 在 osnbr1 突变体中观察到 OsRBOH9 (呼吸突发氧化酶同类物) 的表达增加,与 ROS.升高相关.
结论:
- OsNBR1作为米中的盐应激耐受性的积极调节者.
- OsNBR1主要通过影响ROS积累而不是离子传输来调节盐分耐受性.
- OsNBR1-OsRBOH9通路对于在中盐应激期间管理ROS水平至关重要.
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