The Dual Role of Nitric Oxide in Guard Cells: Promoting and Attenuating the ABA and Phospholipid-Derived Signals Leading to the Stomatal Closure.

Ana M Laxalt,Lorenzo Lamattina,Carlos García-Mata

doi:10.3389/fpls.2016.00476

Abstract

The Dual Role of Nitric Oxide in Guard Cells: Promoting and Attenuating the ABA and Phospholipid-Derived Signals Leading to the Stomatal Closure.

Highlights

Molecular and Integrative Physiology, Instituto de Investigaciones Biológicas, CONICET-Universidad Nacional de Mar del Plata, Mar del Plata, Argentina
Abscisic acid (ABA) signaling in guard cells involves several mechanisms sustained by enzymes, small molecules, and second messengers that promote the inactivation of inward-rectifying K+ (IK, in) channels, activation of outward-rectifying K+ (IK, out) channel, and activation of slow and rapid-anion channels (MacRobbie, 2006), resulting in the facilitation of solute efflux from guard cells and stomatal closure
The ABA receptor is a complex structure formed by a family of soluble proteins known as pyrabactin resistance/regulatory component of ABA receptor (PYR/PYL/RCAR) (Ma et al, 2009; Park et al, 2009), which interacts with a protein phosphatase-kinase complex, functioning as a double negative regulatory system (Umezawa et al, 2009; Vlad et al, 2009)

Summary

Introduction

Molecular and Integrative Physiology, Instituto de Investigaciones Biológicas, CONICET-Universidad Nacional de Mar del Plata, Mar del Plata, Argentina. It has been recently found that activated OST1 interacts with type 2A protein phosphatase (PP2A)-subunits (Waadt et al, 2015), which are functional proteins proposed to positively and negatively regulate the ABA signaling in guard cells (Kwak et al, 2002; Pernas et al, 2007).

Results

Conclusion