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New Regulatory Mechanisms of the SOS Pathway for Salt Tolerance

AuthorsMoreno, José Ramón; García-Martín, Elena; Villalta, Irene ; Pardo, José M. ; Quintero, Francisco J.
Issue Date14-Jun-2015
PublisherSociedad Española de Fisiología Vegetal
Sociedade Portuguesa de Fisiologia Vegetal
CitationXXI Reunión de la Sociedad Española de Fisiología Vegetal y XIV Congreso Hispano-Luso de Fisiología Vegetal, 14 - 17 de junio de 2015, en Toledo (España)
AbstractThe 505 signaling pathway has emerged as an essential mechanism for salt-tolerance in plants (Ji et al 2013). The cytosolic Ca> rise triggered by Na' accumulation is sensed by the Ca> binding protein 5053 that interacts with and activates the protein kinase 5052. The 5053/5052 complex phosphorylates and upregulates the final target 5051, the plasma membrane Na+/H+ antiporter (Quintero et al, 2011). Here, we present evidence that, at least, two additional mechanisms of regulation of the 505 pathway existo One involves MPK6, a mitogen activated protein kinase that also phosphorylates 5051 and enhances its transport activity. Another regulation layer is the direct interaction of 5053 and 5051. This binding of 5053 is independent of 5052 and probably controls both the targeting of 5051 to the plasma membrane and the Na' efflux mediated by the antiporter.
Publisher version (URL)http://www.fv2015.org/index.php/inicio
Appears in Collections:(IRNAS) Comunicaciones congresos
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