Linking water relations and hydraulics with photosynthesis

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Abstract

For land plants, water is the principal governor of growth. Photosynthetic performance is highly dependent on the stable and suitable water status of leaves, which is balanced by the water transport capacity, the water loss rate as well as the water capacitance of the plant. This review discusses the links between leaf water status and photosynthesis, specifically focussing on the coordination of CO2 and water transport within leaves, and the potential role of leaf capacitance and elasticity on CO2 and water transport.

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Mesophyll conductance to CO2: current knowledge and future prospects.

Jaume Flexas, Miquel Ribas-Carbó, Antonio Diaz-Espejo … (2008)

During photosynthesis, CO2 moves from the atmosphere (C(a)) surrounding the leaf to the sub-stomatal internal cavities (C(i)) through stomata, and from there to the site of carboxylation inside the chloroplast stroma (C(c)) through the leaf mesophyll. The latter CO2 diffusion component is called mesophyll conductance (g(m)), and can be divided in at least three components, that is, conductance through intercellular air spaces (g(ias)), through cell wall (g(w)) and through the liquid phase inside cells (g(liq)). A large body of evidence has accumulated in the past two decades indicating that g(m) is sufficiently small as to significantly decrease C(c) relative to C(i), therefore limiting photosynthesis. Moreover, g(m) is not constant, and it changes among species and in response to environmental factors. In addition, there is now evidence that g(liq) and, in some cases, g(w), are the main determinants of g(m). Mesophyll conductance is very dynamic, changing in response to environmental variables as rapid or even faster than stomatal conductance (i.e. within seconds to minutes). A revision of current knowledge on g(m) is presented. Firstly, a historical perspective is given, highlighting the founding works and methods, followed by a re-examination of the range of variation of g(m) among plant species and functional groups, and a revision of the responses of g(m) to different external (biotic and abiotic) and internal (developmental, structural and metabolic) factors. The possible physiological bases for g(m), including aquaporins and carbonic anhydrases, are discussed. Possible ecological implications for variable g(m) are indicated, and the errors induced by neglecting g(m) when interpreting photosynthesis and carbon isotope discrimination models are highlighted. Finally, a series of research priorities for the near future are proposed.

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Plant resistance to drought depends on timely stomatal closure

Nicolas K. Martin-StPaul, Sylvain Delzon, Hervé Cochard … (2017)

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Effects of Water Deficits on Carbon Assimilation

Célia Regina M. M. Chaves (1991)

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Author and article information

Journal

Title: The Plant Journal

Abbreviated Title: Plant J

Publisher: Wiley

ISSN (Print): 0960-7412

ISSN (Electronic): 1365-313X

Publication date Created: January 06 2020

Publication date Created: February 2020

Publication date (Electronic): December 08 2019

Publication date (Print): February 2020

Volume: 101

Issue: 4

Pages: 800-815

Affiliations

[1 ]National Key Laboratory of Crop Genetic Improvement, MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River College of Plant Science and Technology Huazhong Agricultural University Wuhan Hubei 430070 China

[2 ]Research Group on Plant Biology under Mediterranean Conditions Departament de Biologia Universitat de les Illes Balears (UIB) - Institute of Agro-Environmental Research and Water Economy (INAGEA) Carretera de Valldemossa 07122 Palma Spain