Horaruang, W. et al. (2022) Engineering a K+ channel 'sensory antenna' enhances stomatal kinetics, water use efficiency and photosynthesis. Nature Plants, 8(11), pp. 1262-1274. (doi: 10.1038/s41477-022-01255-2) (PMID:36266492)
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Abstract
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.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Hills, Mr Adrian and Carroll, William and Klejchova, Mrs Martina and Blatt, Professor Michael and Zhang, Dr Ben and Alvim, Mr Jonas and Amtmann, Professor Anna and Papanatsiou, Dr Maria and Horaruang, Wijitra and Waghmare, Dr Sakharam and Lima Silva Alvim, Mrs Fernanda |
| Authors: | Horaruang, W., Klejchová, M., Carroll, W., Silva-Alvim, F. A.L., Waghmare, S., Papanatsiou, M., Amtmann, A., Hills, A., Alvim, J. C., Blatt, M. R., and Zhang, B. |
| College/School: | College of Medical Veterinary and Life Sciences > School of Molecular Biosciences |
| Journal Name: | Nature Plants |
| Publisher: | Nature Research |
| ISSN: | 2055-026X |
| ISSN (Online): | 2055-0278 |
| Published Online: | 20 October 2022 |
| Copyright Holders: | Copyright © 2022 The Authors |
| First Published: | First published in Nature Plants 8(11) 1262-1274 |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
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