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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Authors | Dimas M Ribeiro, Radhika Desikan, Jo Bright, Ana Confraria, Judith Harrison, John T Hancock, Raimundo S Barros, Steven J Neill, Ian D Wilson |
Journal | Plant, cell & environment
(Plant Cell Environ)
Vol. 32
Issue 1
Pg. 46-57
(Jan 2009)
ISSN: 1365-3040 [Electronic] United States |
PMID | 19021879
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Arabidopsis Proteins
- Plant Growth Regulators
- Water
- Nitric Oxide
- Abscisic Acid
- Nitrate Reductase
- Calcium
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Topics |
- Abscisic Acid
(metabolism)
- Arabidopsis
(genetics, metabolism, physiology)
- Arabidopsis Proteins
(metabolism)
- Calcium
(metabolism)
- Light
- Mutation
- Nitrate Reductase
(metabolism)
- Nitric Oxide
(metabolism)
- Plant Growth Regulators
(metabolism)
- Plant Stomata
(metabolism, physiology)
- Water
(physiology)
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