| Mesophyll conductance to CO2: current knowledge and future prospects. | |
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MedLine Citation:
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PMID: 17996013 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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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Authors:
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Jaume Flexas; Miquel Ribas-Carbó; Antonio Diaz-Espejo; Jeroni Galmés; Hipólito Medrano |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Review Date: 2007-11-07 |
Journal Detail:
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Title: Plant, cell & environment Volume: 31 ISSN: 1365-3040 ISO Abbreviation: Plant Cell Environ. Publication Date: 2008 May |
Date Detail:
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Created Date: 2008-04-14 Completed Date: 2008-09-17 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 9309004 Medline TA: Plant Cell Environ Country: United States |
Other Details:
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Languages: eng Pagination: 602-21 Citation Subset: IM |
Affiliation:
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Grup de Recerca en Biologia de les Plantes en Condicions Mediterrànies, Departament de Biologia, Universitat de les Illes Balears, Carretera de Valldemossa Km 7.5, 07122 Palma de Mallorca, Balears, Spain. jaume.flexas@uib.es |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Carbon Dioxide
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metabolism* Photosynthesis / physiology* Plant Leaves / cytology* Plant Physiological Phenomena |
| Chemical | |
Reg. No./Substance:
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124-38-9/Carbon Dioxide |
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