ABA signaling in stomata and nitric oxide


Nitric oxide is a novel component of abscisic acid signaling in stomatal guard cells.

by Neill S. J., Desikan R., Clarke A., Hancock J. T. (2002)

  1. Steven J. Neill
  2. Radhika Desikan
  3. Andrew Clarke
  4. John T. Hancock

Centre for Research in Plant Science, University of the West of England, Bristol, Coldharbour Lane, Bristol BS16 1QY, United Kingdom


in Plant Physiology 128, 13-16. – doi: http://dx.doi.org/10.1104/pp.010707 – 

CrossRef | CAS | PubMed | FREE Full Text – PubMed Abstract | CrossRef Full Text | Google Scholar – 



Stomatal closure in response to the hormone abscisic acid (ABA) is mediated by a complex signaling network involving both calcium-dependent and calcium-independent pathways (Assmann and Shimazaki, 1999; Webb et al., 2001), activated by several signaling intermediates (Schroeder et al., 2001) that include hydrogen peroxide (Miao et al., 2000; Pei et al., 2000;Zhang et al., 2001) and lipids such as sphingosine-1-phosphate (Ng et al., 2001).

Here, we provide evidence that nitric oxide (NO) is also a signaling component of ABA-induced stomatal closure.

Our data show that NO synthesis is required for ABA-induced closure and that ABA enhances NO synthesis in guard cells.

Exogenous NO induces stomatal closure, and ABA and NO-induced closure require the synthesis and action of cGMP and cyclic ADP Rib (cADPR).



Published by

Willem Van Cotthem

Honorary Professor of Botany, University of Ghent (Belgium). Scientific Consultant for Desertification and Sustainable Development.

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