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Inhibition of root plasma membrane H+-ATPase by drought is mediated by the abscisic acid signalling pathway

AuthorsPlanes, María Dolores; Hassan M., Younis; Serrano, Ramón
Issue Date2-Jan-2015
Citation4th International Workshop - Plant Abiotic Stress (2011)
AbstractThe plasma membrane H+-ATPase of stomata gueard cells is inhibited by abscisisc acid (ABA) during drought stress and this is important for stomata closure (Merlot et al, 2007, EMBO J 26: 3216). In the present work we have investigated the regulation of the enzyme by drought and ABA in wheat and Arabidopsis roots. Root H+-ATPase is inhibited by drought. Addition of ABA was also inhibitory and no inhibition by drought was observed in an ABA-insensitive Arabidopsis mutant. Inhibition of H+-ATPase correlates with neither decreased phosphorylation of the penultimate threonine nor decreased amount of the enzyme. An inhibitory phosphorylation mediated by ABA-activated protein kinases (SnRK2) is proposed.
DescriptionPoster presented at the 4th International Workshop - Plant Abiotic Stress, Cyprus, November 17th, 2011.
Appears in Collections:(IBMCP) Comunicaciones congresos
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