通过与Arabidopsis中的KNAT5和OFP1相互作用,AtHSPR在吉伯雷林介导的初级根生长中发挥作用
Guoqiang Yuan1, Yuke Lian1, Junmei Wang1
1Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China.
Plant cell reports
|August 19, 2023
概括
阿拉比多普西斯·塔利亚纳与热冲击相关的蛋白质 (AtHSPR) 通过与KNAT5和OFP1.1相互作用来调节初级根生长. 这种复合物影响着贝利酸 (GA) 信号传递和根介质系统活动,影响着植物的发育.
科学领域:
- 植物生物学 植物生物学
- 分子遗传学 分子遗传学
- 发展生物学 发展生物学
背景情况:
- 植物的根生长对发育至关重要,并通过吉伯酸 (GA) 信号传递和根介质系统维护来调节.
- 已知Arabidopsis Thaliana与热冲击蛋白相关 (AtHSPR) 调节开花时间和盐应激耐受性,但其在初级根生长中的作用在很大程度上是未知的.
研究的目的:
- 为了研究AtHSPR在调节阿拉比多西斯 (Arabidopsis thaliana) 的初级根生长中的功能.
- 确定参与根部发展的AtHSPR的交互合作伙伴.
- 阐明AtHSPR影响根生长的分子机制,特别是在GA信号传递方面.
主要方法:
- 对athspr突变和过度表达线的遗传分析.
- 酵母两杂交测试以确定蛋白质与蛋白质之间的相互作用.
- 对基因表达的分析,特别是GA20ox1.1.
- 在不同的GA3度下,初级根生长的表型特征.
主要成果:
- 与野生类型植物相比,athspr突变体表现出明显较短的初级根.
- 发现AtHSPR与KNAT5和OFP1.1相互作用.
- 过度表达KNAT5或OFP1模仿了athspr突变现型,而它们的淘汰则拯救了athspr突变中的短根现型.
- AtHSPR-KNAT5-OFP1复合体调节GA生物合成基因GA20ox1的表达,影响根髓系统活动和延长.
结论:
- 在HSPR,KNAT5和OFP1中形成一个复合体,通过GA介导的根髓系统活动来调节初级根生长.
- 在对GA的反应中,KNAT5-OFP1充当了AtHSPR的负调节者.
- 该AtHSPR-KNAT5-OFP1模块影响GA20ox1的表达,为植物提供了一个机制,以根据环境线索调整根生长可塑性.
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