Document Detail

Hydrogen peroxide production is an early event during bicarbonate induced stomatal closure in abaxial epidermis of Arabidopsis.
MedLine Citation:
PMID:  17160388     Owner:  NLM     Status:  MEDLINE    
The presence of 2 mM bicarbonate in the incubation medium induced stomatal closure in abaxial epidermis of Arabidopsis. Exposure to 2 mM bicarbonate elevated the levels of H(2)O(2) in guard cells within 5 min, as indicated by the fluorescent probe, dichlorofluorescein diacetate (H(2)DCF-DA). Bicarbonate-induced stomatal closure as well as H(2)O(2) production were restricted by exogenous catalase or diphenylene iodonium (DPI, an inhibitor of NAD(P)H oxidase). The reduced sensitivity of stomata to bicarbonate and H(2)O(2) production in homozygous atrbohD/F double mutant of Arabidopsis confirmed that NADP(H) oxidase is involved during bicarbonate induced ROS production in guard cells. The production of H(2)O(2) was quicker and greater with ABA than that with bicarbonate. Such pattern of H(2)O(2) production may be one of the reasons for ABA being more effective than bicarbonate, in promoting stomatal closure. Our results demonstrate that H(2)O(2) is an essential secondary messenger during bicarbonate induced stomatal closure in Arabidopsis.
V A Kolla; A Vavasseur; A S Raghavendra
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-12-08
Journal Detail:
Title:  Planta     Volume:  225     ISSN:  0032-0935     ISO Abbreviation:  Planta     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-04-19     Completed Date:  2007-07-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1250576     Medline TA:  Planta     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1421-9     Citation Subset:  IM    
Department of Plant Sciences, School of Life Sciences, University of Hyderabad, Hyderabad, 500 046, India.
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MeSH Terms
Abscisic Acid / pharmacology
Androstadienes / pharmacology
Arabidopsis / metabolism*
Bicarbonates / pharmacology*
Chromones / pharmacology
Hydrogen Peroxide / metabolism*
Morpholines / pharmacology
NADPH Oxidase / metabolism
Phosphatidylinositol Phosphates / metabolism
Plant Leaves / drug effects*,  metabolism*
Time Factors
Reg. No./Substance:
0/Androstadienes; 0/Bicarbonates; 0/Chromones; 0/Morpholines; 0/Phosphatidylinositol Phosphates; 0/phosphatidylinositol 3-phosphate; 154447-36-6/2-(4-morpholinyl)-8-phenyl-4H-1-benzopyran-4-one; 19545-26-7/wortmannin; 21293-29-8/Abscisic Acid; 7722-84-1/Hydrogen Peroxide; EC Oxidase

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