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  • Title: Differential requirement for NO during ABA-induced stomatal closure in turgid and wilted leaves.
    Author: Ribeiro DM, Desikan R, Bright J, Confraria A, Harrison J, Hancock JT, Barros RS, Neill SJ, Wilson ID.
    Journal: Plant Cell Environ; 2009 Jan; 32(1):46-57. PubMed ID: 19021879.
    Abstract:
    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 Ca(2+)-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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