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| Título: | The AtNHX1 exchanger mediates potassium compartmentation in vacuoles of transgenic tomato |
Autor: | Leidi, Eduardo O. CSIC ORCID ; Pardo, José M. CSIC ORCID ; Barragán, Verónica CSIC; El Hamdaoui, Addelaziz; Ruiz, Mª Teresa; Cubero, Beatriz CSIC ; Quintero, Francisco J. CSIC ORCID | Palabras clave: | NA+/H+ Antiporter Gene Confers salt tolerance CV heavenly-blue Zostera-Marina L. Plasma-membrane Arabidopsis thaliana Morning glory Physiological evidence Flower coloration Ion homeostasis |
Fecha de publicación: | feb-2010 | Editor: | Wiley-Blackwell | Citación: | The Plant Journal 61(3): 495-506 (2010) | Resumen: | NHX-type antiporters in the tonoplast have been reported to increase the salt tolerance of various plants species, and are thought to mediate the compartmentation of Na+ in vacuoles. However, all isoforms characterized so far catalyze both Na+/H+ and K+/H+ exchange. Here, we show that AtNHX1 has a critical involvement in the subcellular partitioning of K+, which in turn affects plant K+ nutrition and Na+ tolerance. Transgenic tomato plants overexpressing AtNHX1 had larger K+ vacuolar pools in all growth conditions tested, but no consistent enhancement of Na+ accumulation was observed under salt stress. Plants overexpressing AtNHX1 have a greater capacity to retain intracellular K+ and to withstand salt-shock. Under K+-limiting conditions, greater K+ compartmentation in the vacuole occurred at the expense of the cytosolic K+ pool, which was lower in transgenic plants. This caused the early activation of the high-affinity K+ uptake system, enhanced K+ uptake by roots, and increased the K+ content in plant tissues and the xylem sap of transformed plants. Our results strongly suggest that NHX proteins are likely candidates for the H+-linked K+ transport that is thought to facilitate active K+ uptake at the tonoplast, and the partitioning of K+ between vacuole and cytosol. | Descripción: | Ledidi, Eduardo O. et al.-- 12 páginas, 6 figuras, 3 tablas. | Versión del editor: | http://dx.doi.org/10.1111/j.1365-313X.2009.04073.x | URI: | http://hdl.handle.net/10261/37780 | DOI: | 10.1111/j.1365-313X.2009.04073.x | ISSN: | 0960-7412 | E-ISSN: | 1365-313X |
| Aparece en las colecciones: | (IRNAS) Artículos |
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| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| The_AtNHX1_exchanger.pdf | 4,42 MB | Adobe PDF |  Visualizar/Abrir |
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