Salt and osmotic stress cause rapid increases in Arabidopsis thaliana cGMP levels

Lara Donaldson, Ndiko Ludidi, Marc R. Knight, Christoph Gehring, Katherine Denby*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

121 Scopus citations


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 (≤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.

Original languageEnglish (US)
Pages (from-to)317-320
Number of pages4
JournalFEBS Letters
Issue number1-3
StatePublished - Jul 2 2004


  • CNGCs, cyclic nucleotide gated ion channels
  • Cytosolic calcium
  • NaCl stress
  • Osmotic stress
  • cAMP, 3,5-cyclic adenosine monophosphate
  • cGMP
  • cGMP, 3,5-cyclic guanosine monophosphate

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology


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