胃膜积极调节Arabidopsis的口腔密度
Shigeo S Sugano1, Tomoo Shimada, Yu Imai
1Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
Nature
|December 17, 2009
概括
科学家们发现了胃原蛋白,一种新型的,可以积极调节牙发育. 这一发现有助于理解植物如何控制口腔密度以有效吸收二氧化碳.
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:
- 胃膜调节CO2的吸收和植物的透气,影响全球碳循环.
- 口腔发育是由遗传和环境因素控制的,有已知的负调节器 (EPF1,EPF2) 和一个未知的正调节器.
- 类似TMM受体的蛋白质参与调解口腔发育信号.
研究的目的:
- 识别和描述涉及植物口腔发育的新型细胞间信号传递因子.
- 研究一种新发现的,胃原蛋白在调节口腔密度中的作用.
- 阐明由美索菲尔衍生的信号影响表皮口腔形成的机制.
主要方法:
- 在植物分析中分析了胃原对口腔发育的影响.
- 使用重组和合成胃原的半体外分析.
- 基因分析以确定STOMAGEN和TMM之间的表观关系.
主要成果:
- 一种新型的分泌, stomagen,被确定为一种在血管植物中保存的口腔发育的积极调节者.
- 斯托马根是由前体蛋白STOMAGEN衍生而来的,它表现出剂量依赖的胃炎诱导活性.
- 基因分析显示TMM对STOMAGEN具有表皮性,表明调节剂与受体的竞争性结合.
- 胃体表达局部化到美索菲尔组织中,而不是形成胃口的表皮组织.
结论:
- 胃原是一个 mesophyll-derived 的正调节器的口腔密度.
- 胃膜发育是通过正 (胃膜) 和负 (EPF1/EPF2) 调节器与TMM受体的竞争性相互作用来微调的.
- 这种机制允许内部光合作用组织优化表皮口腔密度,以有效吸收二氧化碳并改善植物功能.
相关概念视频
02:04Regulation of Transpiration by Stomata
26.2K
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.
26.2K
01:57Adaptations that Reduce Water Loss
24.2K
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.
24.2K
02:45Responses to Heat and Cold Stress
13.5K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
13.5K
01:25Cell Signaling in Plants
4.5K
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...
4.5K