米酶OsMRLK63通过调节反应性氧物种生产,有助于干旱耐受性
Xiu-Qing Jing1,2, Peng-Tao Shi1, Ran Zhang1
1National Key Laboratory of Crop Improvement for Stress Tolerance and Production/College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China.
Plant physiology
|December 26, 2023
概括
植物利用OsMRLK63通过OsRALF45/46来感知干旱信号,激活ROS生产以提高干旱耐受性. 这一发现揭示了植物应激反应的关键分子途径.
科学领域:
- 植物生物学 植物生物学
- 分子信号传输的方法
- 压力生理学 压力生理学
背景情况:
- 干旱压力显著影响作物产量,但植物耐受性的分子机制尚未完全理解.
- 类似受体的激酶,特别是含有malectin/malectin类域的类似受体的激酶 (MRLKs),涉及到各种信号通路,但它们在干旱反应中的作用需要进一步研究.
研究的目的:
- 阐明OsMRLK63在大米干旱耐受性中的作用.
- 识别参与OsMRLK63介导干旱反应的上游信号分子和下游效应因子.
主要方法:
- 使用生物化学测试研究了OsMRLK63和OsRALF45/46之间的相互作用.
- 通过OsMRLK63.3分析了NADPH氧化酶的酸化.
- 以OsMRLK63-依赖的方式评估OsRALF45/46应用对大米干旱耐受性的影响.
主要成果:
- OsMRLK63积极调节大米的干旱耐受性和反应性氧物种 (ROS) 生产.
- OsMRLK63与NADPH氧化酶相互作用和酸化,特别是在Ser26.6的OsRbohA.
- 使用OsRALF45/46可以缓解干旱引起的脱水,这取决于OsMRLK63和ROS的产生.
- OsRALF45/46与OsMRLK63的细胞外域结合,这表明有直接感应机制.
结论:
- 确定了一种新型信号模块 (OsRALF45/46-OsMRLK63-OsRbohs),对干旱压力信号和水耐受性至关重要.
- OsMRLK63作为OsRALF45/46的受体,启动一个依赖ROS的干旱适应途径.
相关概念视频
Cell Signaling in Plants
5.6K
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
5.6K
Adaptations that Reduce Water Loss
25.6K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
25.6K
Responses to Drought and Flooding
10.7K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
10.7K
Regulation of Transpiration by Stomata
28.3K
During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.
28.3K
Responses to Salt Stress
13.1K
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
13.1K
MAPK Signaling Cascades
5.5K
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
5.5K


