Guard cell endomembrane Ca 2+ -ATPases underpin a 'carbon memory' of photosynthetic assimilation that impacts on water-use efficiency.

Autor: Jezek M; Laboratory of Plant Physiology and Biophysics, University of Glasgow, Glasgow, UK., Silva-Alvim FAL; Laboratory of Plant Physiology and Biophysics, University of Glasgow, Glasgow, UK., Hills A; Laboratory of Plant Physiology and Biophysics, University of Glasgow, Glasgow, UK., Donald N; Laboratory of Plant Physiology and Biophysics, University of Glasgow, Glasgow, UK., Ishka MR; Department of Biochemistry and Molecular Biology, University of Nevada, Reno, NV, USA., Shadbolt J; Laboratory of Plant Physiology and Biophysics, University of Glasgow, Glasgow, UK., He B; Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China., Lawson T; School of Life Sciences, University of Essex, Colchester, UK., Harper JF; Department of Biochemistry and Molecular Biology, University of Nevada, Reno, NV, USA., Wang Y; Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China., Lew VL; Physiological Laboratory, University of Cambridge, Cambridge, UK., Blatt MR; Laboratory of Plant Physiology and Biophysics, University of Glasgow, Glasgow, UK. Michael.Blatt@glasgow.ac.uk.; Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China. Michael.Blatt@glasgow.ac.uk.
Jazyk: angličtina
Zdroj: Nature plants [Nat Plants] 2021 Sep; Vol. 7 (9), pp. 1301-1313. Date of Electronic Publication: 2021 Jul 29.
DOI: 10.1038/s41477-021-00966-2
Abstrakt: Stomata of most plants close to preserve water when the demand for CO 2 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 CO 2 . Guided by mechanistic modelling that incorporates foliar CO 2 diffusion and mesophyll photosynthesis, here we uncover a central role for endomembrane Ca 2+ stores in guard cell responsiveness to fluctuating light and CO 2 . Modelling predicted and experiments demonstrated a delay in Ca 2+ cycling that was enhanced by endomembrane Ca 2+ -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.
(© 2021. The Author(s), under exclusive licence to Springer Nature Limited.)
Databáze: MEDLINE
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