Izumi C. Mori

TL;DR: Identification of two partially redundant Arabidopsis guard cell‐expressed NADPH oxidase catalytic subunit genes, AtrbohD and atrbohF, are reported, providing direct molecular genetic and cell biological evidence that ROS are rate‐limiting second messengers in ABA signaling, and that the AtrbOHD and AtrabohF NADPH oxidationases function in guard cell ABA signal transduction.

TL;DR: Findings show important functions of the CPK6 and CPK3 CDPKs in guard cell ion channel regulation and provide genetic evidence for calcium sensors that transduce stomatal ABA signaling.

TL;DR: In this paper, the protein phosphatase 2C (PP2C) mutant abi1-1 disrupted ABA activation of ICa channels and showed that the activation of these ICa Ca2+ channels requires the presence of NAD(P)H in the cytosol.

TL;DR: Evidence is emerging that ROS production occurs in response to many physiological stimuli in plant cells, including pathogen attack, hormone signaling, polar growth, and gravitropism.

TL;DR: Analysis of SA-induced stomatal closure, production of reactive oxygen species (ROS) and nitric oxide, cytosolic calcium ion oscillations and inward-rectifying potassium channel activity in Arabidopsis indicates that SA induces stomatic closure accompanied with extracellular ROS production mediated by SHAM-sensitive peroxidase, intracellular ROS accumulation and K+(in) channel inactivation.