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Stomatal and mesophyll conductances to CO2 in different plantgroups: Underrated factors for predicting leaf photosynthesisresponses to climate change?

Citation

Flexas, J and Carriqui, M and Coopman, RE and Gago, J and Galmes, J and Martorell, S and Morales, F and Diaz-Espejo, A, Stomatal and mesophyll conductances to CO2 in different plantgroups: Underrated factors for predicting leaf photosynthesisresponses to climate change?, Plant Science, 226 pp. 41-48. ISSN 0168-9452 (2014) [Refereed Article]

Copyright Statement

2014 Elsevier Ireland Ltd. All rights reserved.

DOI: doi:10.1016/j.plantsci.2014.06.011

Abstract

The climate change conditions predicted for the end of the current century are expected to have an impact on the performance of plants under natural conditions. The variables which are foreseen to have a larger effect are increased CO2 concentration and temperature. Although it is generally considered CO2 assimilation rate could be increased by the increasing levels of CO2, it has been reported in previous studies that acclimation to high CO2 results in reductions of physiological parameters involved in photosynthesis, like the maximum carboxylation rate (Vc,max), stomatal conductance (gs) and mesophyll conductance to CO2 (gm). On the one hand, most of the previous modeling efforts have neglected the potential role played by the acclimation of gm to high CO2 and temperature. On the other hand, the effect of climate change on plant clades other than angiosperms, like ferns, has received little attention, and there are no studies evaluating the potential impact of increasing CO2 and temperature on these species.

In this study we predicted responses of several representative species among angiosperms, gymnosperms and ferns to increasing CO2 and temperature. Our results show that species with lower photosynthetic capacity such as some ferns and gymnosperms would be proportionally more favored under these foreseen environmental conditions. The main reason for this difference is the lower diffusion limitation imposed by gs and gm in plants having high capacity for photosynthesis among the angiosperms, which reduces the positive effect of increasing CO2. However, this apparent advantage of low-diffusion species would be canceled if the two conductances gs and gm acclimate and are down regulated to high CO2, which is basically unknown, especially for gymnosperms and ferns. Hence, for a better understanding of different plant responses to future climate, studies are urged in which the actual photosynthetic response/acclimation to increased CO2 and temperature of ferns, gymnosperms and other under-evaluated plant groups is assessed.

Item Details

Item Type:Refereed Article
Keywords:climatic change, angiosperms, photosynthesis, mesophyll conductance, ferns, diffusive limitations
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Other Plant Production and Plant Primary Products
Objective Field:Plant Production and Plant Primary Products not elsewhere classified
UTAS Author:Carriqui, M (Mr Marc Carriqui Alcover)
ID Code:134462
Year Published:2014
Web of Science® Times Cited:27
Deposited By:Plant Science
Deposited On:2019-08-14
Last Modified:2019-09-09
Downloads:0

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