Engineering a K+ channel ‘sensory antenna’ enhances stomatal kinetics, water use efficiency and photosynthesis

编号 040037103

推送时间 20221128

研究领域 森林培育 

年份 2022 

类型 期刊 

语种 英语

标题 Engineering a K+ channel ‘sensory antenna’ enhances stomatal kinetics, water use efficiency and photosynthesis

来源期刊 Nature Plants

期 第371期

发表时间 20221020

关键词 K+ channel;  stomatal kinetics;  water use efficiency;  photosynthesis;  Arabidopsis thaliana;  ‘sensory antenna’; 

摘要 Stomata of plant leaves open to enable CO2 entry for photosynthesis and close to reduce water loss via transpiration. Compared with photosynthesis, stomata respond slowly to fluctuating light, reducing assimilation and water use efficiency. Efficiency gains are possible without a cost to photosynthesis if stomatal kinetics can be accelerated. Here we show that clustering of the GORK channel, which mediates K+ efflux for stomatal closure in the model plant Arabidopsis, arises from binding between the channel voltage sensors, creating an extended ‘sensory antenna’ for channel gating. Mutants altered in clustering affect channel gating to facilitate K+ flux, accelerate stomatal movements and reduce water use without a loss in biomass. Our findings identify the mechanism coupling channel clustering with gating, and they demonstrate the potential for engineering of ion channels native to the guard cell to enhance stomatal kinetics and improve water use efficiency without a cost in carbon fixation.

服务人员 孙小满

服务院士 尹伟伦

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