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Differential requirement for NO during ABA-induced stomatal closure in turgid and wilted leaves.

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.
AuthorsDimas M Ribeiro, Radhika Desikan, Jo Bright, Ana Confraria, Judith Harrison, John T Hancock, Raimundo S Barros, Steven J Neill, Ian D Wilson
JournalPlant, cell & environment (Plant Cell Environ) Vol. 32 Issue 1 Pg. 46-57 (Jan 2009) ISSN: 1365-3040 [Electronic] United States
PMID19021879 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Arabidopsis Proteins
  • Plant Growth Regulators
  • Water
  • Nitric Oxide
  • Abscisic Acid
  • Nitrate Reductase
  • Calcium
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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