Cytosolic pH regulates root water transport during anoxic stress through gating of aquaporins

Colette Tournaire-Roux, Moira Sutka, Hélène Javot, Elisabeth Gout, Patricia Gerbeau, Doan-Trung Luu, Richard Bligny and Christophe Maurel ()
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Colette Tournaire-Roux: Institut National de la Recherche Agronomique, Université Montpellier 2 et Ecole Nationale d'Agronomie
Moira Sutka: Institut National de la Recherche Agronomique, Université Montpellier 2 et Ecole Nationale d'Agronomie
Hélène Javot: Institut National de la Recherche Agronomique, Université Montpellier 2 et Ecole Nationale d'Agronomie
Elisabeth Gout: Commissariat à l'Energie Atomique, Rue des Martyrs
Patricia Gerbeau: Institut National de la Recherche Agronomique, Université Montpellier 2 et Ecole Nationale d'Agronomie
Doan-Trung Luu: Institut National de la Recherche Agronomique, Université Montpellier 2 et Ecole Nationale d'Agronomie
Richard Bligny: Commissariat à l'Energie Atomique, Rue des Martyrs
Christophe Maurel: Institut National de la Recherche Agronomique, Université Montpellier 2 et Ecole Nationale d'Agronomie

Nature, 2003, vol. 425, issue 6956, 393-397

Abstract: Abstract Flooding of soils results in acute oxygen deprivation (anoxia) of plant roots during winter in temperate latitudes, or after irrigation1, and is a major problem for agriculture. One early response of plants to anoxia and other environmental stresses is downregulation of water uptake due to inhibition of the water permeability (hydraulic conductivity) of roots (Lpr)2,3,4,5. Root water uptake is mediated largely by water channel proteins (aquaporins) of the plasma membrane intrinsic protein (PIP) subgroup6,7,8. These aquaporins may mediate stress-induced inhibition of Lpr2,4,9 but the mechanisms involved are unknown. Here we delineate the whole-root and cell bases for inhibition of water uptake by anoxia and link them to cytosol acidosis. We also uncover a molecular mechanism for aquaporin gating by cytosolic pH. Because it is conserved in all PIPs, this mechanism provides a basis for explaining the inhibition of Lpr by anoxia and possibly other stresses. More generally, our work opens new routes to explore pH-dependent cell signalling processes leading to regulation of water transport in plant tissues or in animal epithelia10.

Date: 2003
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DOI: 10.1038/nature01853

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