The histidine kinase AHK5 integrates endogenous and environmental signals in Arabidopsis guard cells.

ABSTRACT:

Background

Stomatal guard cells monitor and respond to environmental and endogenous signals such that the stomatal aperture is continually optimised for water use efficiency. A key signalling molecule produced in guard cells in response to plant hormones, light, carbon dioxide and pathogen-derived signals is hydrogen peroxide (H(2)O(2)). The mechanisms by which H(2)O(2) integrates multiple signals via specific signalling pathways leading to stomatal closure is not known.

Principal findings

Here, we identify a pathway by which H(2)O(2), derived from endogenous and environmental stimuli, is sensed and transduced to effect stomatal closure. Histidine kinases (HK) are part of two-component signal transduction systems that act to integrate environmental stimuli into a cellular re

SUBMITTER: Desikan R 

PROVIDER: S-EPMC2424244 | biostudies-literature | 2008 Jun

REPOSITORIES: biostudies-literature