Journal
FEBS LETTERS
Volume 569, Issue 1-3, Pages 317-320Publisher
WILEY
DOI: 10.1016/j.febslet.2004.06.016
Keywords
NaCl stress; osmotic stress; cGMP; cytosolic calcium; second messenger; Arabidopsis thaliana
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A guanylyl cyclase has been recently identified in Arabidopsis but, despite the use of pharmacological inhibitors to infer roles of the second messenger 3',5'-cyclic guanosine monophosphate (cGMP), very few measurements of actual cGMP levels in plants are available. Here, we demonstrate that cGMP levels in Arabidopsis seedlings increase rapidly (less than or equal to 5 s) and to different degrees after salt and osmotic stress, and that the increases are prevented by treatment with LY, an inhibitor of soluble guanylyl cyclases. In addition, we provide evidence to suggest that salt stress activates two cGMP signalling pathways an osmotic, calcium-independent pathway and an ionic, calcium-dependent pathway. (C) 2004 Published by Elsevier B.V. on behalf of the Federation of European Biochemical Societies.
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