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JXB Advance Access originally published online on December 12, 2003
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Journal of Experimental Botany, Vol. 55, No. 396, pp. 539-541, February 1, 2004
© 2004 Oxford University Press

GENE NOTE

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

Received 11 August 2003; Accepted 3 November 2003

Félicie Lopez*, Agnès Bousser, Igor Sissoëff, Jackson Hoarau and Aline Mahé{dagger}

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

* Present address: Université d’Avignon, Faculté des Sciences UMR A408, 33 rue Louis Pasteur, F-84000 Avignon. France.
{dagger} To whom correspondence should be addressed. Fax: +33 1 69 15 34 24. E-mail: mahe{at}ibp.u-psud.fr

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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