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Mesophyll conductance: the leaf corridors for photosynthesis


Gago, J and Daloso, DM and Carriqui, M and Nadal, M and Morales, M and Araujo, WL and Nunes-Nesi, A and Flexas, J, Mesophyll conductance: the leaf corridors for photosynthesis, Biochemical Society. Transactions, 48, (2) pp. 429-439. ISSN 1470-8752 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 The Author(s). Published by Portland Press Limited on behalf of the Biochemical Society

DOI: doi:10.1042/BST20190312


Besides stomata, the photosynthetic CO2 pathway also involves the transport of CO2 from the sub-stomatal air spaces inside to the carboxylation sites in the chloroplast stroma, where Rubisco is located. This pathway is far to be a simple and direct way, formed by series of consecutive barriers that the CO2 should cross to be finally assimilated in photosynthesis, known as the mesophyll conductance (gm). Therefore, the gm reflects the pathway through different air, water and biophysical barriers within the leaf tissues and cell structures. Currently, it is known that gm can impose the same level of limitation (or even higher depending of the conditions) to photosynthesis than the wider known stomata or biochemistry. In this mini-review, we are focused on each of the gm determinants to summarize the current knowledge on the mechanisms driving gm from anatomical to metabolic and biochemical perspectives. Special attention deserve the latest studies demonstrating the importance of the molecular mechanisms driving anatomical traits as cell wall and the chloroplast surface exposed to the mesophyll airspaces (Sc/S) that significantly constrain gm. However, even considering these recent discoveries, still is poorly understood the mechanisms about signaling pathways linking the environment a/biotic stressors with gm responses. Thus, considering the main role of gm as a major driver of the CO2 availability at the carboxylation sites, future studies into these aspects will help us to understand photosynthesis responses in a global change framework.

Item Details

Item Type:Refereed Article
Keywords:cell wall, chloroplast, CO2 diffusion pathway, mesophyll diffusion conductance, photosynthesis, stomatal conductance
Research Division:Biological Sciences
Research Group:Biochemistry and cell biology
Research Field:Cell development, proliferation and death
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:Carriqui, M (Mr Marc Carriqui Alcover)
ID Code:152819
Year Published:2020
Web of Science® Times Cited:18
Deposited By:Research Performance and Analysis
Deposited On:2022-08-24
Last Modified:2022-09-16

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