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Plant Physiol, September 2000, Vol. 124, pp. 415-422

Zinc Deficiency Up-Regulates Expression of High-Affinity Phosphate Transporter Genes in Both Phosphate-Sufficient and -Deficient Barley Roots1

Chunyuan Huang,* Susan Jane Barker, Peter Langridge, Frank W. Smith, and Robin David Graham

Department of Plant Science, The University of Adelaide, Glen Osmond, South Australia 5064, Australia (C.H., P.L., R.D.G.); Faculty of Agriculture, The University of Western Australia, Nedlands, Western Australia 6907, Australia (S.J.B.); and Commonwealth Scientific and Industrial Research Organization Tropical Agriculture, Cunningham Laboratory, 306 Carmody Road, St. Lucia, Queensland 4067, Australia (F.W.S.)

Phosphate (P) is taken up by plants through high-affinity P transporter proteins embedded in the plasma membrane of certain cell types in plant roots. Expression of the genes that encode these transporters responds to the P status of the plants, and their transcription is normally tightly controlled. However, this tight control of P uptake is lost under Zn deficiency, leading to very high accumulation of P in plants. We examined the effect of plant Zn status on the expression of the genes encoding the HVPT1 and HVPT2 high-affinity P transporters in barley (Hordeum vulgare L. cv Weeah) roots. The results show that the expression of these genes is intimately linked to the Zn status of the plants. Zn deficiency induced the expression of genes encoding these P transporters in plants grown in either P-sufficient or -deficient conditions. Moreover, the role of Zn in the regulation of these genes is specific in that it cannot be replaced by manganese (a divalent cation similar to Zn). It appears that Zn plays a specific role in the signal transduction pathway responsible for the regulation of genes encoding high-affinity P transporters in plant roots. The significance of Zn involvement in the regulation of genes involved in P uptake is discussed.

1 This work was supported by the Australian Research Council and The Australian Research Council Special Research Centre for Basic and Applied Plant Molecular Biology. The Australian Grains Research and Development Corporation supported research related to the identification of genes encoding phosphate transporters in barley.

* Corresponding author; e-mail chunyuan.huang{at}adelaide.edu.au; fax 61-8-8303-4399.

© 2000 American Society of Plant Physiologists


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