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PMID: 25077787 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Review

Mesophyll photosynthesis and guard cell metabolism impacts on stomatal behaviour.

The New phytologist ·Vol. 203 ·No. 4 ·2014-09-00 ·Pages 1064-1081

Lawson T, Simkin AJ, Kelly G, Granot D

Abstract

Stomata control gaseous fluxes between the internal leaf air spaces and the external atmosphere. Guard cells determine stomatal aperture and must operate to ensure an appropriate balance between CO2 uptake for photosynthesis (A) and water loss, and ultimately plant water use efficiency (WUE). A strong correlation between A and stomatal conductance (gs ) is well documented and often observed, but the underlying mechanisms, possible signals and metabolites that promote this relationship are currently unknown. In this review we evaluate the current literature on mesophyll-driven signals that may coordinate stomatal behaviour with mesophyll carbon assimilation. We explore a possible role of various metabolites including sucrose and malate (from several potential sources; including guard cell photosynthesis) and new evidence that improvements in WUE have been made by manipulating sucrose metabolism within the guard cells. Finally we discuss the new tools and techniques available for potentially manipulating cell-specific metabolism, including guard and mesophyll cells, in order to elucidate mesophyll-derived signals that coordinate mesophyll CO2 demands with stomatal behaviour, in order to provide a mechanistic understanding of these processes as this may identify potential targets for manipulations in order to improve plant WUE and crop yield.

Keywords
communication guard cells malate mesophyll mesophyll guard cell interactions photosynthesis stomata sucrose
MeSH Terms
Aquaporins/metabolism Mesophyll Cells/physiology Osmoregulation Photosynthesis Plant Stomata/cytology,metabolism Signal Transduction
Chemicals
Aquaporins
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Lawson Tracy
School of Biological Sciences, University of Essex, Colchester, CO4 3SQ, UK.
Simkin Andrew J
School of Biological Sciences, University of Essex, Colchester, CO4 3SQ, UK.
Kelly Gilor
Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Bet-Dagan, 50250, Israel.
Granot David
Institute of Plant Sciences, Agricultural Research Organization, The Volcani Center, Bet-Dagan, 50250, Israel.
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Article Info
Journal
The New phytologist
Abbr.
New Phytol
ISSN
1469-8137
DOI
10.1111/nph.12945
Published
2014-09-00
Pages
1064-1081
Language
English
Region
England
NLM ID
9882884
Subset
IM
Grants
Biotechnology and Biological Sciences Research Council · BB/J004138/1 · United Kingdom
Biotechnology and Biological Sciences Research Council · BB/L001187/1 · United Kingdom
External Links
PubMed source DOI: 10.1111/nph.12945 View journal details
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