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Estimating Mesophyll Conductance from Measurements of C 18 OO Photosynthetic Discrimination and Carbonic Anhydrase Activity

hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorOGÉE, Jérôme
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorWINGATE, Lisa
hal.structure.identifierInstitut de Biosciences et Biotechnologies d'Aix-Marseille (ex-IBEB) [BIAM]
hal.structure.identifierProtéines de Protection des Végétaux [PPV]
hal.structure.identifierPhotosynthèse & Environnement [P&E]
dc.contributor.authorGENTY, Bernard
dc.date.accessioned2024-04-08T12:08:31Z
dc.date.available2024-04-08T12:08:31Z
dc.date.issued2018-10-05
dc.identifier.issn0032-0889
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196522
dc.description.abstractEnCarbonic anhydrase (CA) activity in leaves catalyzes the O-18 exchange between CO2 and water during photosynthesis. This feature has been used to estimate the mesophyll conductance to CO2 (g(m)) from measurements of online (COO)-O-18 photosynthetic discrimination (Delta O-18) Based on CA assays on leaf extracts, it has been argued that CO2 in mesophyll cells should be in isotopic equilibrium with water in most C-3 species as well as many C-4 dicot species. However, this seems incompatible with Delta O-18 data that would indicate a much lower degree of equilibration, especially in C-4 plants under high light intensity. This apparent contradiction is resolved here using a new model of C-3 and C-4 photosynthetic discrimination that includes competition between CO2 hydration and carboxylation and the contribution of respiratory fluxes. This new modeling framework is used to revisit previously published data sets on C-3 and C-4 species, including CA-deficient plants. We conclude that (1) newly Delta O-18-derived g(m) values are usually close but significantly higher (typically 20% and up to 50%) than those derived assuming full equilibration and (2) despite the uncertainty associated with the respiration rate in light, or the water isotope gradient between mesophyll and bundle sheath cells, robust estimates of Delta O-18-derived g(m) can be achieved in both C-3 and C-4 plants.
dc.description.sponsorshipEtude des mécanismes de régulation de l'anhydrase carbonique et des flux de COS et CO18O dans les écosystèmes terrestres - ANR-13-BS06-0005
dc.language.isoen
dc.publisherOxford University Press ; American Society of Plant Biologists
dc.title.enEstimating Mesophyll Conductance from Measurements of C 18 OO Photosynthetic Discrimination and Carbonic Anhydrase Activity
dc.typeArticle de revue
dc.identifier.doi10.1104/pp.17.01031
dc.subject.halSciences du Vivant [q-bio]
dc.description.sponsorshipEuropeCollaborative Research: Quantifying Stratified Turbulence in Estuaries
dc.description.sponsorshipEuropeCellular Transport Agents: Applications and Mechanism
dc.description.sponsorshipEurope"Food security, Agriculture, Climate Change ERA-NET plus"
bordeaux.journalPlant Physiology
bordeaux.page728-752
bordeaux.volume178
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue2
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifiercea-01968958
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//cea-01968958v1
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