Leaf anatomy does not explain apparent short-term responses of mesophyll conductance to light and CO2 in tobacco

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dc.contributor.author Carriquí, Marc
dc.contributor.author Douthe, Cyril
dc.contributor.author Molins, Arántzazu
dc.contributor.author Flexas, Jaume
dc.date.accessioned 2023-03-20T07:46:25Z
dc.date.available 2023-03-20T07:46:25Z
dc.identifier.uri http://hdl.handle.net/11201/160309
dc.description.abstract [eng] Mesophyll conductance to CO2 (gm), a key photosynthetic trait, is strongly constrained by leaf anatomy. Leaf anatomical parameters such as cell wall thickness and chloroplast area exposed to the mesophyll intercellular airspace have been demonstrated to determine gm in species with diverging phylogeny, leaf structure and ontogeny. However, the potential implication of leaf anatomy, especially chloroplast movement, on the short-term response of gm to rapid changes (i.e. seconds to minutes) under different environmental conditions (CO2, light or temperature) has not been examined. The aim of this study was to determine whether the observed rapid variations of gm in response to variations of light and CO2 could be explained by changes in any leaf anatomical arrangements. When compared to high light and ambient CO2, the values of gm estimated by chlorophyll fluorescence decreased under high CO2 and increased at low CO2, while it decreased with decreasing light. Nevertheless, no changes in anatomical parameters, including chloroplast distribution, were found. Hence, the gm estimated by analytical models based on anatomical parameters was constant under varying light and CO2. Considering this discrepancy between anatomy and chlorophyll fluorescence estimates, it is concluded that apparent fast gm variations should be due to artefacts in its estimation and/or to changes in the biochemical components acting on diffusional properties of the leaf (e.g. aquaporins and carbonic anhydrase).
dc.format application/pdf
dc.relation.isformatof Versió preprint del document publicat a: https://doi.org/10.1111/ppl.12755
dc.relation.ispartof Physiologia Plantarum, 2019, vol. 165, num. 3, p. 604-618
dc.rights (c) Scandinavian Plant Physiology Society, 2019
dc.subject.classification 57 - Biologia
dc.subject.other 57 - Biological sciences in general
dc.title Leaf anatomy does not explain apparent short-term responses of mesophyll conductance to light and CO2 in tobacco
dc.type info:eu-repo/semantics/article
dc.type info:eu-repo/semantics/submittedVersion
dc.date.updated 2023-03-20T07:46:25Z
dc.rights.accessRights info:eu-repo/semantics/openAccess
dc.identifier.doi https://doi.org/10.1111/ppl.12755

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