植物保护细胞S型阴离子通道功能需要SLAC1在口腔信号中
Triin Vahisalu1, Hannes Kollist, Yong-Fei Wang
1Plant Biology, Department of Biological and Environmental Sciences, University of Helsinki, FI-00014 Helsinki, Finland.
Nature
|February 29, 2008
概括
研究人员确定SLOW ANION CHANNEL-ASSOCIATED 1 (SLAC1) 是一种关键的基因,可以调节植物的口腔毛孔. 在应对各种环境信号时,SLAC1对于口腔关闭至关重要,影响二氧化碳吸收和臭氧敏感性.
科学领域:
- 植物生理学 植物生理学
- 分子生物学分子生物学
- 环境科学 环境科学
背景情况:
- 胃孔调节二氧化碳的吸收和水的流失,这对植物的生存和全球碳固定至关重要.
- 臭氧是一种空气污染物,对作物产量和气候调节产生负面影响.
- 护卫细胞离子通道被认为是口腔关闭的调节者,但它们的遗传基础尚不清楚.
研究的目的:
- 确定负责调节口腔运动和臭氧敏感性的基因.
- 描述在护卫细胞中已识别的基因的功能.
- 阐明这些基因在植物对环境刺激的反应中的作用.
主要方法:
- 对臭氧敏感的阿拉比多普西斯·塔利亚纳 (Arabidopsis thaliana) 突变物 (slac1) 的绘制和描述.
- 基因表达分析以确定SLAC1定位.
- 在口腔关闭和离子通道活性中SLAC1的功能分析.
主要成果:
- 鉴定并描述了SLAC1 (SLOW ANION CHANNEL-ASSOCIATED 1) 作为一种在护卫细胞中优先表达的基因.
- 证明SLAC1对于应对CO2,ABA,臭氧和其他环境线索的口腔关闭至关重要.
- 表明SLAC1突变会损害缓慢的 (S型) 离子通道电流,这表明它在酸盐运输中的作用.
结论:
- SLAC1是一种重要的血膜蛋白,调节口腔关闭和植物对环境压力的反应.
- SLAC1在S型离子通道的功能中起着至关重要的作用,影响植物气体交换和污染物防御.
- 了解SLAC1的功能是提高作物对环境变化和空气污染的抵御能力的关键.
相关概念视频
01:19Contact-dependent Signaling
40.2K
Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
Gap Junctions
In animal cells, gap junctions are formed...
40.2K
01:19Ion Channels
68.1K
The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
68.1K
02:32Plasmodesmata
30.0K
The organs in a multicellular organism’s body are made up of tissues formed by cells. To work together cohesively, cells must communicate. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.
30.0K
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
01:21G-Protein Gated Ion Channels
5.5K
GPCRs are primarily responsible for our sense of smell, taste, and vision. The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory...
Sensory...
5.5K
01:27Gap Junctions
9.3K
The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
9.3K