Abscisic acid-independent stomatal CO₂ signal transduction pathway and convergence of CO₂ and ABA signaling downstream of OST1 kinase.

ABSTRACT: Stomatal pore apertures are narrowing globally due to the continuing rise in atmospheric [CO₂]. CO₂ elevation and the plant hormone abscisic acid (ABA) both induce rapid stomatal closure. However, the underlying signal transduction mechanisms for CO₂/ABA interaction remain unclear. Two models have been considered: (i) CO₂ elevation enhances ABA concentrations and/or early ABA signaling in guard cells to induce stomatal closure and (ii) CO₂ signaling merges with ABA at OST1/SnRK2.6 protein kinase activation. Here we use genetics, ABA-reporter imaging, stomatal conductance, patch clamp, and biochemical analyses to investigate these models. The strong ABA biosynthesis mutants nced3/nced5 and aba2-1 remain respo

SUBMITTER: Hsu PK 

PROVIDER: S-EPMC6196521 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature