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


Carriqui, M and Douthe, C and Molins, A and Flexas, J, Leaf anatomy does not explain apparent short-term responses of mesophyll conductance to light and CO2 in tobacco, Physiologia Plantarum, 165, (3) pp. 604-618. ISSN 0031-9317 (2019) [Refereed Article]

Copyright Statement

Copyright 2018 Scandinavian Plant Physiology Society

DOI: doi:10.1111/ppl.12755


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).

Item Details

Item Type:Refereed Article
Keywords:carbon dioxide, drug effect, mesophyll cell, metabolism, photosynthesis, plant leaf, tobacco
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Industrial crops
Objective Field:Industrial crops not elsewhere classified
UTAS Author:Carriqui, M (Mr Marc Carriqui Alcover)
ID Code:134470
Year Published:2019
Web of Science® Times Cited:33
Deposited By:Plant Science
Deposited On:2019-08-14
Last Modified:2019-09-11

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