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Na+ and K+ transporters in plant signaling.

AuthorsPardo, José M. ; Rubio, Francisco
Issue Date2011
CitationTransporters and Pumps in Plant Signaling 7: 65-98 (2011)
AbstractPotassium is an essential macronutrient for plants that fulfills important functions related to enzyme activation, osmotic adjustment, regulation of membrane electric potential, growth and development. K+ concentration in the soil solution may vary greatly and is always below the relatively constant concentration of 100 mM found in the cytoplasm of plant cells. To secure K+ acquisition from the soil and its distribution within the plant, cell membranes are furnished with a suite of K+ transport systems. Because Na+ is the most abundant cation in saline soils and Na+ is chemically very similar to K+, cytosolic Na+ toxicity if often concurrent with K+ deficiency. In addition, the high external salt concentrations lower the water potential of the soil solution making water uptake by plant roots more difficult. To avert Na+ toxicity, plants use an array Na+ transport systems aimed at preventing the build up of high cytosolic Na+ concentrations by restricting Na+ uptake, enhancing Na+ efflux, or mediating the sequestration of Na+ into vacuoles. In addition, Na+ transport systems for Na+ movement within the plant facilitate its translocation to tissues and organs where toxicity is minimal. Here we present an updated overview of the main mechanisms involved in the regulation of K+ and Na+ transport systems that are key factors in securing K+ nutrition and salt tolerance.
DescriptionEste trabajo pertenece al libro citado, Part II: Signaling related to ion transport. 1st Edition., 2011, X, 378 p. 40 illus., 28 in color.
Publisher version (URL)http://dx.doi.org/10.1007/978-3-642-14369-4
Appears in Collections:(IRNAS) Libros y partes de libros
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