Abstract
A family of genes that encode phosphate transporters has been isolated from the barley genome. Three of these genes, HVPT1, HVPT2 and HVPT3 are expressed in the roots. The polypeptides encoded by HVPT1, IIVPT2 and HVPT3 are similar in structure and show significant homology to phosphate transporters that have been isolated from dicotyledonous species. There is a high level of homology between HVPT1 and HVPT2 and these two genes are closely linked, lying on the same 20kB fragment of the genome. Although homologous in conserved regions and having a similar topology to HVPT1 and HVPT2, the polypeptide encoded by HVPT3 differs significantly from HVPT1 and HVPT2.
The expression of these root phosphate transporter genes is regulated by the phosphate status of the plant. Using probes that are specific for HVPT1, HVPT2 and HVPT3 the effects of phosphorus deprivation and resupply on regulation of the expression of these genes in barley root and shoot tissue has been studied. These data, together with the effects of some other nutrient deficiencies on expression of these genes will be presented.
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© 1999 Springer Science+Business Media Dordrecht
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Smith, F.W., Cybinski, D.H., Rae, A.L. (1999). Regulation of Expression of Genes Encoding Phosphate Transporters in Barley Roots. In: Gissel-Nielsen, G., Jensen, A. (eds) Plant Nutrition — Molecular Biology and Genetics. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2685-6_19
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DOI: https://doi.org/10.1007/978-94-017-2685-6_19
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