Mesophyll conductance: the leaf corridors for photosynthesis.

Biochemical Society Transactions
Jorge GagoJaume Flexas

Abstract

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 mecha...Continue Reading

References

Nov 3, 2004·Biochimica Et Biophysica Acta·Anthony G Lee
Oct 3, 2006·The Plant Journal : for Cell and Molecular Biology·Jaume FlexasRalf Kaldenhoff
Jul 31, 2007·Plant, Cell & Environment·Thomas D SharkeyEric L Singsaas
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Sep 17, 2014·Plant, Cell & Environment·Susanne von Caemmerer, John R Evans
Sep 4, 2015·Physiological Reviews·Christophe MaurelLionel Verdoucq

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Citations

May 12, 2020·The Plant Journal : for Cell and Molecular Biology·Marc CarriquíJaume Flexas
Mar 30, 2021·Journal of Experimental Botany·Jaume FlexasMarc Carriquí
Jul 9, 2021·Photosynthesis Research·Sajad HussainWeiguo Liu
Jun 22, 2021·Journal of Experimental Botany·Zhangying LeiYali Zhang
Oct 7, 2021·The New Phytologist·Santiago TruebaCraig Brodersen

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