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JXB Advance Access published online on December 12, 2003
Journal of Experimental Botany, doi:10.1093/jxb/052
© 2003 by Oxford University Press
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Received August 11, 2003; accepted November 3, 2003
© 2003 Society for Experimental Biology

GENE NOTE

Characterization in maize of ZmTIP2-3, a root-specific tonoplast intrinsic protein exhibiting aquaporin activity

Félicie Lopez 1, Agnès Bousser 1, Igor Sissoëff 1, Jackson Hoarau 1, and Aline Mahé 1*

1 Institut de Biotechnologie des Plantes, Bât. 630, CNRS/UMR 8618, Université Paris-Sud, F-91405 Orsay Cedex, France


  Abstract

The characterization of the tonoplast intrinsic protein ZmTIP2-3 cDNA isolated from maize roots is reported. ZmTIP2-3 belongs to the TIP2 group according to the present nomenclature. The aquaporin function of ZmTIP2-3 protein was demonstrated using expression in X. laevis oocytes. Northern blot analyses revealed that ZmTIP2-3 was specifically expressed in roots. Salt and water stresses induced the accumulation of ZmTIP2-3 transcripts. By contrast, no effect of ABA was observed. An oscillation of ZmTIP2-3 transcript amount during the day-night cycle was observed with some typical features of genes regulated by a circadian mechanism.

Key words: Aquaporin, root, tonoplast intrinsic protein (TIP), Zea mays.


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