A stomatal safety-efficiency trade-off constrains responses to leaf dehydration

Nature Communications
Christian HenryLawren Sack

Abstract

Stomata, the microvalves on leaf surfaces, exert major influences across scales, from plant growth and productivity to global carbon and water cycling. Stomatal opening enables leaf photosynthesis, and plant growth and water use, whereas plant survival of drought depends on stomatal closure. Here we report that stomatal function is constrained by a safety-efficiency trade-off, such that species with greater stomatal conductance under high water availability (gmax) show greater sensitivity to closure during leaf dehydration, i.e., a higher leaf water potential at which stomatal conductance is reduced by 50% (Ψgs50). The gmax - Ψgs50 trade-off and its mechanistic basis is supported by experiments on leaves of California woody species, and in analyses of previous studies of the responses of diverse flowering plant species around the world. Linking the two fundamental key roles of stomata-the enabling of gas exchange, and the first defense against drought-this trade-off constrains the rates of water use and the drought sensitivity of leaves, with potential impacts on ecosystems.

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Citations

Oct 2, 2019·The New Phytologist·Alex Williams, Franciska T de Vries
Jan 17, 2020·The Plant Journal : for Cell and Molecular Biology·Methawi Chomthong, Howard Griffiths
Jan 29, 2020·Journal of Experimental Botany·Viviana ArausGloria M Coruzzi
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Aug 8, 2020·The New Phytologist·Anna S Westbrook, Scott A M McAdam
Mar 3, 2020·Frontiers in Plant Science·Laura Serna
Feb 23, 2020·Ecology and Evolution·Junyan DingYvonne E Martin
Apr 2, 2020·Proceedings of the National Academy of Sciences of the United States of America·Anna T TrugmanWilliam R L Anderegg
Dec 11, 2020·Journal of Experimental Botany·Megan K Bartlett, Gabriela Sinclair
Apr 25, 2021·The New Phytologist·Victor FloRafael Poyatos
Nov 20, 2021·The Plant Journal : for Cell and Molecular Biology·Jose Carlos HerreraUri Hochberg
Oct 22, 2021·Ecological Applications : a Publication of the Ecological Society of America·Hsiao-Hsuan Chu, Claire Farrell

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Methods Mentioned

BETA
light microscopy

Software Mentioned

SMATR
caper
ImageJ
MATLAB
Web
Phylomatic
R

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