Differential requirement for NO during ABA-induced stomatal closure in turgid and wilted leaves
Ribeiro, D. M., Desikan, R., Bright, J., Confraria, A., Harrison, J., Hancock, J. T., Barros, R. S., Neill, S. and Wilson, I. D. (2009) Differential requirement for NO during ABA-induced stomatal closure in turgid and wilted leaves. Plant Cell Environment, 32 (1). pp. 46-57. ISSN 0140-7791 Available from: http://eprints.uwe.ac.uk/8289
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Publisher's URL: http://dx.doi.org/10.1111/j.1365-3040.2008.01906.x
Abscisic acid (ABA)-induced stomatal closure is mediated by a complex, guard cell signalling network involving nitric oxide (NO) as a key intermediate. However, there is a lack of information concerning the role of NO in the ABA-enhanced stomatal closure seen in dehydrated plants. The data herein demonstrate that, while nitrate reductase (NR)1-mediated NO generation is required for the ABA-induced closure of stomata in turgid leaves, it is not required for ABA-enhanced stomatal closure under conditions leading to rapid dehydration. The results also show that NO signalling in the guard cells of turgid leaves requires the ABA-signalling pathway to be both capable of function and active. The alignment of this NO signalling with guard cell Ca2+-dependent/independent ABA signalling is discussed. The data also highlight a physiological role for NO signalling in turgid leaves and show that stomatal closure during the light-to-dark transition requires NR1-mediated NO generation and signalling.