Jezek, M. et al. (2021) Guard cell endomembrane Ca2+-ATPases underpin a ‘carbon memory’ of photosynthetic assimilation that impacts on water-use efficiency. Nature Plants, 7(9), pp. 1301-1313. (doi: 10.1038/s41477-021-00966-2) (PMID:34326530)
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Abstract
Stomata of most plants close to preserve water when the demand for CO2 by photosynthesis is reduced. Stomatal responses are slow compared with photosynthesis, and this kinetic difference erodes assimilation and water-use efficiency under fluctuating light. Despite a deep knowledge of guard cells that regulate the stoma, efforts to enhance stomatal kinetics are limited by our understanding of its control by foliar CO2. Guided by mechanistic modelling that incorporates foliar CO2 diffusion and mesophyll photosynthesis, here we uncover a central role for endomembrane Ca2+ stores in guard cell responsiveness to fluctuating light and CO2. Modelling predicted and experiments demonstrated a delay in Ca2+ cycling that was enhanced by endomembrane Ca2+-ATPase mutants, altering stomatal conductance and reducing assimilation and water-use efficiency. Our findings illustrate the power of modelling to bridge the gap from the guard cell to whole-plant photosynthesis, and they demonstrate an unforeseen latency, or ‘carbon memory’, of guard cells that affects stomatal dynamics, photosynthesis and water-use efficiency.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Hills, Mr Adrian and Jezek, Mareike and Blatt, Professor Michael and Wang, Dr Yizhou and Donald, Miss Naomi and Lima Silva Alvim, Mrs Fernanda |
| Authors: | Jezek, M., Silva-Alvim, F. A.L., Hills, A., Donald, N., Ishka, M. R., Shadbolt, J., He, B., Lawson, T., Harper, J. F., Wang, Y., Lew, V. L., and Blatt, M. R. |
| 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: | 29 July 2021 |
| Copyright Holders: | Copyright © 2021 Springer Nature Limited |
| First Published: | First published in Nature Plants 7(9): 1301-1313 |
| Publisher Policy: | Reproduced in accordance with the publisher copyright policy |
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