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)
- Steven J. Neill
- Radhika Desikan
- Andrew Clarke
- 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 –
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).