An immunoaffinity purified plant natriuretic peptide analogue modulates cGMP levels in the Zea mays root stele

M. Pharmawati, C. A. Gehring, H. R. Irving*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


Natriuretic peptides (NPs) are a family of peptide hormones strongly implicated in the regulation of salt and water homeostasis in vertebrates. Recently, evidence has been presented for the presence of a NP hormone system in plants. Atrial natriuretic peptide (ANP) bound specifically to isolated leaf membranes and promoted stomatal opening in a concentration and conformation dependent manner. We have immunoaffinity purified biologically active plant NP analogues from Hedera helix (ivy). Here we report that one of these immunoreactive plant NP fractions rapidly and specifically increases cyclic guanosine-3',5'-monophosphate (cGMP) levels in stele tissue isolated from maize roots within 30 s. ANP and kinetin do not affect cGMP levels in maize root stele tissue. Moreover LY 83583 an inhibitor of guanylate cyclase does not affect any of these responses. Since LY 83583 does not always inhibit particulate guanylate cyclase, these results support the existence of a membrane bound PNP receptor containing intrinsic guanylate cyclase activity analogous to animal NP receptors. We postulate the presence of biologically active PNP system in the stele and speculate that it modulates solute movements in and out of this tissue.

Original languageEnglish (US)
Pages (from-to)107-115
Number of pages9
JournalPlant Science
Issue number1
StatePublished - Sep 23 1998
Externally publishedYes

Bibliographical note

Funding Information:
We thank Gail Dyson for her assistance with the mass spectroscopic analysis, Dr Gideon Polya for his kind donation of calmodulin and phosphodiesterase and Dr Evi Eitle for her helpful guidance in extracting cGMP and establishing the radioimmunoassay. M. Pharmawati is in receipt of an AUSAID scholarship and C.A. Gehring and H.R. Irving receive support from the Australian Research Council.


  • Natriuretic peptide hormone
  • Stele
  • Zea mays
  • cGMP

ASJC Scopus subject areas

  • Genetics
  • Agronomy and Crop Science
  • Plant Science


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