A bifurcating pathway directs abscisic acid effects on stomatal closure and opening in Arabidopsis

Science
Girish MishraX Q Wang

Abstract

Terrestrial plants lose water primarily through stomata, pores on the leaves. The hormone abscisic acid (ABA) decreases water loss by regulating opening and closing of stomata. Here, we show that phospholipase Dalpha1 (PLDalpha1) mediates the ABA effects on stomata through interaction with a protein phosphatase 2C (PP2C) and a heterotrimeric GTP-binding protein (G protein) in Arabidopsis. PLDalpha1-produced phosphatidic acid (PA) binds to the ABI1 PP2C to signal ABA-promoted stomatal closure, whereas PLDalpha1 and PA interact with the Galpha subunit of heterotrimeric G protein to mediate ABA inhibition of stomatal opening. The results reveal a bifurcating signaling pathway that regulates plant water loss.

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Citations

Mar 9, 2013·Plant Cell Reports·Martin JandaEric Ruelland
Jul 21, 2011·Protoplasma·David SeungJan Marc
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Jun 11, 2008·Proceedings of the National Academy of Sciences of the United States of America·Liu-Min FanSarah M Assmann
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May 10, 2012·Plant Physiology·Kun JiangAlan M Jones

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