2021
DOI: 10.1038/s41477-021-00966-2
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Guard cell endomembrane Ca2+-ATPases underpin a ‘carbon memory’ of photosynthetic assimilation that impacts on water-use efficiency

Abstract: Stomata of most plants close to preserve water when the demand for CO2 by photosynthesis is reduced. Stomatal responses are slow compared to photosynthesis, and this kinetic difference erodes assimilation and water use efficiencies 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 photosyn… Show more

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Cited by 35 publications
(55 citation statements)
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References 89 publications
(173 reference statements)
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“…The polar growth of pollen tubes and stomatal closure can be triggered by Ca 2+ oscillations [59,78], allowing Ca 2+ influx into the cytoplasm; subsequently, these specific and asymmetric patterns of oscillations elicit physiological responses [79][80][81]. As the initial plant response signal, Ca 2+ needs selective transport by channels, pumps, and transporters localized on the membranes, based on experimental and modelling approaches [4,[80][81][82]. For example, Ca 2+ -permeable channels lead to a rapid elevation of cytosolic Ca 2+ , and Ca 2+ -ATPases, and Ca 2+ /H + exchangers remove cytosolic Ca 2+ according to the electrochemical gradient [83].…”
Section: Transporters Shape the Ca 2+ Signaturementioning
confidence: 99%
“…The polar growth of pollen tubes and stomatal closure can be triggered by Ca 2+ oscillations [59,78], allowing Ca 2+ influx into the cytoplasm; subsequently, these specific and asymmetric patterns of oscillations elicit physiological responses [79][80][81]. As the initial plant response signal, Ca 2+ needs selective transport by channels, pumps, and transporters localized on the membranes, based on experimental and modelling approaches [4,[80][81][82]. For example, Ca 2+ -permeable channels lead to a rapid elevation of cytosolic Ca 2+ , and Ca 2+ -ATPases, and Ca 2+ /H + exchangers remove cytosolic Ca 2+ according to the electrochemical gradient [83].…”
Section: Transporters Shape the Ca 2+ Signaturementioning
confidence: 99%
“…And how do these connections feedback to g s in the whole leaf? Within OnGuard3 it has proven sufficient for CO 2 (or the bicarbonate anion HCO 3 − and H 2 CO 3 with which CO 2 equilibrates in solution) to regulate Ca 2+ flux through the endomembrane ACA Ca 2+ -ATPase and Ca 2+ channels [71]. This prediction accords with much evidence that associates an increase in [Ca 2+ ] i with elevated pCO 2 [75,76] and more generally with alterations in transport leading to stomatal closure [2].…”
Section: Trends In Plant Sciencementioning
confidence: 61%
“…A subsequent extension incorporated apoplastic water and solute flux, and turgor 'exchange' with the surrounding epidermal cells, to accommodate the opposing mechanical pressure imposed by these cells on stomatal aperture as well as the intrinsic visco-elastic properties of the guard cell wall [70]. Finally, with the latest release, OnGuard3, CO 2 exchange between the atmosphere and the leaf was incorporated to address the feedback of CO 2 and mesophyll photosynthesis on stomatal aperture [71].…”
Section: Modeling Stomatamentioning
confidence: 99%
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