Document Detail

Nitric oxide regulates K+ and Cl- channels in guard cells through a subset of abscisic acid-evoked signaling pathways.
MedLine Citation:
PMID:  12949257     Owner:  NLM     Status:  MEDLINE    
Abscisic acid (ABA) triggers a complex sequence of signaling events that lead to concerted modulation of ion channels at the plasma membrane of guard cells and solute efflux to drive stomatal closure in plant leaves. Recent work has indicated that nitric oxide (NO) and its synthesis are a prerequisite for ABA signal transduction in Arabidopsis and Vicia guard cells. Its mechanism(s) of action is not well defined in guard cells and, generally, in higher plants. Here we show directly that NO selectively regulates Ca2+-sensitive ion channels of Vicia guard cells by promoting Ca2+ release from intracellular stores to raise cytosolic-free [Ca2+]. NO-sensitive Ca2+ release was blocked by antagonists of guanylate cyclase and cyclic ADP ribose-dependent endomembrane Ca2+ channels, implying an action mediated via a cGMP-dependent cascade. NO did not recapitulate ABA-evoked control of plasma membrane Ca2+ channels and Ca2+-insensitive K+ channels, and NO scavengers failed to block the activation of these K+ channels evoked by ABA. These results place NO action firmly within one branch of the Ca2+-signaling pathways engaged by ABA and define the boundaries of parallel signaling events in the control of guard cell movements.
Carlos Garcia-Mata; Robert Gay; Sergei Sokolovski; Adrian Hills; Lorenzo Lamattina; Michael R Blatt
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2003-08-29
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  100     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2003 Sep 
Date Detail:
Created Date:  2003-09-17     Completed Date:  2003-10-29     Revised Date:  2010-09-14    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  11116-21     Citation Subset:  IM    
Institutos de Investigaciones Biologicas, Universidad Nacional de Mar del Plata, Buenos Aires, Argentina.
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MeSH Terms
Abscisic Acid / metabolism*
Calcium / metabolism
Chloride Channels / physiology*
Cyclic ADP-Ribose / antagonists & inhibitors
Guanylate Cyclase / antagonists & inhibitors
Nitric Oxide / physiology*
Potassium Channels / physiology*
Signal Transduction*
Vicia faba / cytology,  metabolism*
Reg. No./Substance:
0/Chloride Channels; 0/Potassium Channels; 10102-43-9/Nitric Oxide; 119340-53-3/Cyclic ADP-Ribose; 21293-29-8/Abscisic Acid; 7440-70-2/Calcium; EC Cyclase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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