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First published online August 28, 2003; 10.1104/pp.103.026815

Plant Physiology 133:126-134 (2003)
© 2003 American Society of Plant Biologists

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ENVIRONMENTAL STRESS AND ADAPTATION

Differential Metal Selectivity and Gene Expression of Two Zinc Transporters from Rice1

Sunita A. Ramesh2, Ryoung Shin, David J. Eide and Daniel P. Schachtman*

Commonwealth Scientific and Industrial Research Organization Plant Industry-Horticulture Unit, Glen Osmond, South Australia 5064, Australia (S.A.R.); Donald Danforth Plant Science Center, St. Louis, Missouri 63132 (R.S., D.P.S.); and Department of Nutritional Sciences, University of Missouri, Columbia, Missouri 65211 (D.J.E.)

Zinc is an essential mineral for a wide variety of physiological and biochemical processes. To understand zinc transport in cereals, we identified putative zinc transporters in gene databases. Three full-length cDNAs were identified and characterized from rice (Oryza sativa). Two of the cDNAs partially complemented a yeast (Saccharomyces cerevisiae) mutant deficient in zinc uptake at low concentrations. The two transporters showed many similarities in function but differed in ionic selectivity and pH optimum of activity. Expression patterns also differed between the two genes. One gene was broadly expressed under all conditions, and the other gene was mainly induced by zinc deficiency to higher levels in roots than in leaves. Although the timing of expression differed between the two genes, localization of expression overlapped in roots. Comparisons of the protein sequences, ionic selectivity, and gene expression patterns of the two transporters suggest that they may play different roles in the physiology of the whole plant.

1 This work was supported by the Cooperative Research Centre for Molecular Plant Breeding (Adelaide, Australia) and by the Korea Science and Engineering Foundation (postdoctoral fellowship to R.S.).

2 Present address: University of Adelaide, Department of Horticulture, Viticulture, and Oenology, Adelaide, South Australia, Australia 5064.

* Corresponding author; e-mail dschachtman{at}danforthcenter.org; fax 314-587-1521.

Received May 13, 2003; returned for revision May 30, 2003; accepted May 30, 2003.




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