Optimal stomatal theory predicts CO2 responses of stomatal conductance in both gymnosperm and angiosperm trees

Gardner, Anna; Jiang, Mingkai; Ellsworth, David S.; MacKenzie, A. Robert; Pritchard, Jeremy; Bader, Martin Karl‐Friedrich; Barton, Craig M.; Bernacchi, Carl; Calfapietra, Carlo; Crous, Kristine Y.; Dusenge, Mirindi Eric; Gimeno, Teresa E.; Hall, Marianne; Lamba, Shubhangi; Leuzinger, Sebastian; Uddling, Johan; Warren, Jeffrey; Wallin, Göran; Medlyn, Belinda E.

doi:10.1111/nph.18618

Title: Optimal stomatal theory predicts CO₂ responses of stomatal conductance in both gymnosperm and angiosperm trees

Journal Article · Sun Nov 13 00:00:00 EST 2022 · New Phytologist

DOI:https://doi.org/10.1111/nph.18618· OSTI ID:1922298

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^[1]; Pritchard, Jeremy ^[1];

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^[3]; Bernacchi, Carl ^[5]; Calfapietra, Carlo ^[6];

^[3]; Dusenge, Mirindi Eric ^[7];

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^[13]; Medlyn, Belinda E. ^[3]

Univ. of Birmingham (United Kingdom)
Western Sydney University (Australia); Zhejiang Univ., Hangzhou (China)
Western Sydney University (Australia)
Linnaeus University (Sweden)
USDA Agricultural Research Service (ARS), Urbana, IL (United States). Global Change and Photosynthesis Research Unit
National Research Council of Italy (CNR) (Italy). Institute of Research on Terrestrial Ecosystems (IRET)
Univ. of Western Ontario, London, ON (Canada)
Centre for Research on Ecology and Forestry Applications (CREAF) (Spain); Basque Centre for Climate Change (Spain)
Lund Univ. (Sweden)
Univ. of Gothenburg (Sweden)
Auckland University of Technology (New Zealand)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences Division; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Climate Change Science Institute
Univ. of Gothenburg (Sweden); Univ. of Oxford (United Kingdom)

Optimal stomatal theory predicts that stomata operate to maximise photosynthesis (A_net) and minimise transpirational water loss to achieve optimal intrinsic water-use efficiency (iWUE). We tested whether this theory can predict stomatal responses to elevated atmospheric CO₂ (eCO₂), and whether it can capture differences in responsiveness among woody plant functional types (PFTs). We conducted a meta-analysis of tree studies of the effect of eCO₂ on iWUE and its components A_net and stomatal conductance (g_s). We compared three PFTs, using the unified stomatal optimisation (USO) model to account for confounding effects of leaf–air vapour pressure difference (D). We expected smaller g_s, but greater A_net, responses to eCO₂ in gymnosperms compared with angiosperm PFTs. We found that iWUE increased in proportion to increasing eCO₂ in all PFTs, and that increases in A_net had stronger effects than reductions in g_s. The USO model correctly captured stomatal behaviour with eCO₂ across most datasets. The chief difference among PFTs was a lower stomatal slope parameter (g₁) for the gymnosperm, compared with angiosperm, species. Land surface models can use the USO model to describe stomatal behaviour under changing atmospheric CO₂ conditions.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER); Australian Research Council; UK Natural Environment Research Council

Grant/Contract Number:: AC05-00OR22725; DE210101654; FL190100003; NE/S015833/1

OSTI ID:: 1922298

Journal Information:: New Phytologist, Vol. 237, Issue 4; ISSN 0028-646X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Optimal stomatal theory predicts CO2 responses of stomatal conductance in both gymnosperm and angiosperm trees

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