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JXB Advance Access published online on June 19, 2009
Journal of Experimental Botany, doi:10.1093/jxb/erp171
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© The Author [2009]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

REVIEW-ARTICLE

Role of aquaporins in leaf physiology

Robert B. Heinen *, Qing Ye * and François Chaumont{dagger}

Institut des Sciences de la Vie, Université catholique de Louvain, Croix du Sud 5-15, B-1348 Louvain-la-Neuve, Belgium

{dagger} To whom correspondence should be addressed: E-mail: francois.chaumont{at}uclouvain.be

Playing a key role in plant growth and development, leaves need to be continuously supplied with water and carbon dioxide to fulfil their photosynthetic function. On its way through the leaf from the xylem to the stomata, water can either move through cell walls or pass from cell to cell to cross the different tissues. Although both pathways are probably used to some degree, evidence is accumulating that living cells contribute substantially to the overall leaf hydraulic conductance (Kleaf). Transcellular water flow is facilitated and regulated by water channels in the membranes, named aquaporins (AQPs). This review addresses how AQP expression and activity effectively regulate the leaf water balance in normal conditions and modify the cell membrane water permeability in response to different environmental factors, such as irradiance, temperature, and water supply. The role of AQPs in leaf growth and movement, and in CO2 transport is also discussed.

Key words: Aquaporin, carbon dioxide, growth, hydraulic conductance, leaf, water

* These two authors contributed equally to this work.

Received 2 February 2009; Revised 1 May 2009 Accepted 5 May 2009


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