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- Title
Salt and osmotic stress cause rapid increases in Arabidopsis thaliana cGMP levels
- Authors
Donaldson, Lara; Ludidi, Ndiko; Knight, Marc R.; Gehring, Chris; Denby, Katherine
- Abstract
A guanylyl cyclase has been recently identified in Arabidopsis but, despite the use of pharmacological inhibitors to infer roles of the second messenger <f>3′</f>,<f>5′</f>-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 (⩽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.
- Subjects
ADENOSINE monophosphate; CYCLIC nucleotides; ION-permeable membranes; BRASSICACEAE
- Publication
FEBS Letters, 2004, Vol 569, Issue 1-3, p317
- ISSN
0014-5793
- Publication type
Article
- DOI
10.1016/j.febslet.2004.06.016