Calcium channels activated by hydrogen peroxide mediate abscisic acid signalling in guard cells.
Published
Journal Article
Drought is a major threat to agricultural production. Plants synthesize the hormone abscisic acid (ABA) in response to drought, triggering a signalling cascade in guard cells that results in stomatal closure, thus reducing water loss. ABA triggers an increase in cytosolic calcium in guard cells ([Ca2+]cyt) that has been proposed to include Ca2+ influx across the plasma membrane. However, direct recordings of Ca2+ currents have been limited and the upstream activation mechanisms of plasma membrane Ca2+ channels remain unknown. Here we report activation of Ca2+-permeable channels in the plasma membrane of Arabidopsis guard cells by hydrogen peroxide. The H2O2-activated Ca2+ channels mediate both influx of Ca2+ in protoplasts and increases in [Ca2+]cyt in intact guard cells. ABA induces the production of H2O2 in guard cells. If H2O2 production is blocked, ABA-induced closure of stomata is inhibited. Moreover, activation of Ca2+ channels by H2O2 and ABA- and H2O2-induced stomatal closing are disrupted in the recessive ABA-insensitive mutant gca2. These data indicate that ABA-induced H2O2 production and the H2O2-activated Ca2+ channels are important mechanisms for ABA-induced stomatal closing.
Full Text
Duke Authors
Cited Authors
- Pei, ZM; Murata, Y; Benning, G; Thomine, S; Klüsener, B; Allen, GJ; Grill, E; Schroeder, JI
Published Date
- August 2000
Published In
Volume / Issue
- 406 / 6797
Start / End Page
- 731 - 734
PubMed ID
- 10963598
Pubmed Central ID
- 10963598
Electronic International Standard Serial Number (EISSN)
- 1476-4687
International Standard Serial Number (ISSN)
- 0028-0836
Digital Object Identifier (DOI)
- 10.1038/35021067
Language
- eng