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JXB Advance Access published online on December 12, 2003
Journal of Experimental Botany, doi:10.1093/jxb/erh033
© 2003 by Oxford University Press
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Received July 14, 2003; accepted October 7, 2003
© 2003 Society for Experimental Biology

CROSS-TALK IN PLANT SIGNAL TRANSDUCTION SPECIAL ISSUE ARTICLE

ABA, hydrogen peroxide and nitric oxide signalling in stomatal guard cells

Radhika Desikan 1*, Man-Kim Cheung 1, Jo Bright 1, Dan Henson 1, John T. Hancock 1, and Steven J. Neill 1

1 Centre for Research in Plant Science, Faculty of Applied Sciences, University of the West of England, Bristol, Coldharbour Lane, Bristol BS16 1QY, UK

* To whom correspondence should be addressed. E-mail: radhika.desikan{at}uwe.ac.uk.


  Abstract

Increased synthesis and redistribution of the phytohormone abscisic acid (ABA) in response to water deficit stress initiates an intricate network of signalling pathways in guard cells leading to stomatal closure. Despite the large number of ABA signalling intermediates that are known in guard cells, new discoveries are still being made. Recently, the reactive oxygen species hydrogen peroxide (H2O2) and the reactive nitrogen species nitric oxide (NO) have been identified as key molecules regulating ABA-induced stomatal closure in various species. As with many other physiological responses in which H2O2 and NO are involved, stomatal closure in response to ABA also appears to require the tandem synthesis and action of both these signalling molecules. Recent pharmacological and genetic data have identified NADPH oxidase as a source of H2O2, whilst nitrate reductase has been identified as a source of NO in Arabidopsis guard cells. Some signalling components positioned downstream of H2O2 and NO are calcium, protein kinases and cyclic GMP. However, the exact interaction between the various signalling components in response to H2O2 and NO in guard cells remains to be established.

Key words: Abscisic acid, guard cells, hydrogen peroxide, nitric oxide, signalling.


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