Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/37947
Título : The phosphate transporter PHT4;6 is a determinant of salt tolerance that is localized to the Golgi apparatus of arabidopsis
Autor : Cubero, Beatriz, Nakagawa, Yuko, Jiang, Xingyu, Miura, Ken-Ji, Li, Fang, Raghothama, K.G., Bressan, Ray A., Hasegawa, Paul M., Pardo, José M.
Palabras clave : Phosphate transport
Phosphate transport
Glycosylation
Salt stress
Fecha de publicación : 2009
Editor: Oxford University Press
Citación : Molecular Plant 2(3): 535-552 (2009)
Resumen: Insertion mutations that disrupt the function of PHT4;6 (At5g44370) cause NaCl hypersensitivity of Arabidopsis seedlings that is characterized by reduced growth of the primary root, enhanced lateral branching, and swelling of root tips. Mutant phenotypes were exacerbated by sucrose, but not by equiosmolar concentrations of mannitol, and attenuated by low inorganic phosphate in the medium. Protein PHT4;6 belongs to the Major Facilitator Superfamily of permeases that shares significant sequence similarity to mammalian type-I Pi transporters and vesicular glutamate transporters, and is a member of the PHT4 family of putative intracellular phosphate transporters of plants. PHT4;6 localizes to the Golgi membrane and transport studies indicate that PHT4;6 facilitates the selective transport of Pi but not of chloride or inorganic anions. Phenotypic similarities with other mutants displaying root swelling suggest that PHT4;6 likely functions in protein N-glycosylation and cell wall biosynthesis, which are essential for salt tolerance. Together, our results indicate that PHT4;6 transports Pi out of the Golgi lumenal space for the re-cycling of the Pi released from glycosylation processes.
Descripción : 18 pages, 12 figures, 81 references.
Versión del editor: http://dx.doi.org/10.1093/mp/ssp013
URI : http://hdl.handle.net/10261/37947
ISSN: 1674-2052
Citación : Molecular Plant 2(3): 535-552 (2009)
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