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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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