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
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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.
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