RAGHOTHAMA, K. G.

VASCONCELOS, M. J. V. de

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P-758PAG-XVI Plant & Animal Genomes Conference - San Diego, California on January 12-16,2008Molecular analyses of glycerol-3-phosphate permease - G3P genes induced by phosphatestress in maizeVasconcelos, M.J.l; Raghothama K. G. 2lEmbrapa Maize and Sorghum, PO box151, Sete Lagoas, MG, Brazil, 35701-9702Department ofHorticulture and Landscape Architecture, Purdue University, WestLafayette-IN 47907Many essential biological processes are carried out inside sub-cellular compartments suchas plastids and mitochondria. These pathways often require an extensive transport mediatedexchange of metabolites between compartments and surrounding cytosol. At some pointalmost all these processes require phosphate. Phosphate shortage may adversely affecttransport across the membranes ofthese isolated compartments. The impact ofPi starvationmay be more severe in compartments such as chloroplasts that are actively exportingorganic-P metabolites in exchange for inorganic phosphorus. Chloroplasts, utilize a varietyof sugar transporters to maintain normal biological activities. Interestingly, many of theseare antiporters that couple the efflux transport of a sugar-phosphate to the influx of PioAmong these include a hexose transporter that exports the products of starch degradationfrom the plastids, an ADP/ATP transporter that supplies plastids with energy forbiosynthesis of a wide variety of compounds transporters belonging to the major facilitatorsuperfamily (MFS) which function as antiporters exchanging Pi for C3 and C6 compounds.G3P, the topic of this study, is also a member of MSF. G3P is strongly induced underphosphate deficiency in maize. These genes exhibit temporal, spatial and phosphatedeficiency associated patterns of expression. Although there were differences in theexpression of phosphate starvation induced genes, no consistent pattem of expressionassociated with either phosphate efficient or inefficient genotypes of maize emerged. Itappears that phosphate efficiency in maize is a complex trait mediated by coordinatedaction of groups of genes either induced or suppressed in response to nutrient deficiency ..

Molecular analyses of glycerol-3-phosphate permease - G3P genes induced by phosphate stress in maize.

http://www.alice.cnptia.embrapa.br/alice/bitstream/doc/491123/1/Molecularanalyses.pdf

Molecular analyses of glycerol-3-phosphate permease - G3P genes induced by phosphate stress in maize.

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