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Título: | High-affinity potassium and sodium transport systems in plants |
Autor: | Rodríguez-Navarro, Alonso; Rubio, Francisco CSIC ORCID | Palabras clave: | Potassium transport Sodium transport |
Fecha de publicación: | 31-ene-2006 | Editor: | Oxford University Press | Citación: | Journal Experimental Botany 57(5): 1149-1160(2006) | Resumen: | All living cells have an absolute requirement for K+, which must be taken up from the external medium. In contrast to marine organisms, which live in a medium with an inexhaustible supply of K+, terrestrial life evolved in oligotrophic environments where the low supply of K+ limited the growth of colonizing plants. In these limiting conditions Na+ could substitute for K+ in some cellular functions, but in others it is toxic. In the vacuole, Na+ is not toxic and can undertake osmotic functions, reducing the total K+ requirements and improving growth when the lack of K+ is a limiting factor. Because of these physiological requirements, the terrestrial life of plants depends on high-affinity K+ uptake systems and benefits from high-affinity Na+ uptake systems. In plants, both systems have received extensive attention during recent years and a clear insight of their functions is emerging. Some plant HAK transporters mediate high-affinity K+ uptake in yeast, mimicking K+ uptake in roots, while other members of the same family may be K+ transporters in the tonoplast. In parallel with the HAK transporters, some HKT transporters mediate high-affinity Na+ uptake without cotransporting K+. HKT transporters have two functions: (i) to take up Na+ from the soil solution to reduce K+ requirements when K+ is a limiting factor, and (ii) to reduce Na+ accumulation in leaves by both removing Na+ from the xylem sap and loading Na+ into the phloem sap. | Versión del editor: | http://dx.doi.org/10.1093/jxb/erj068 | URI: | http://hdl.handle.net/10261/17657 | DOI: | 10.1093/jxb/erj068 | ISSN: | 0022-0957 | E-ISSN: | 1460-2431 |
Aparece en las colecciones: | (CEBAS) Artículos |
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