Natriuretic peptides and cGMP modulate K+, Na+, and H+ fluxes in Zea mays roots

M. Pharmawati, S. N. Shabala, I. A. Newman, C. A. Gehring*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


Recent evidence suggests that in plants, as in vertebrates, natriuretic peptides (NPs) regulate homeostasis. In this study noninvasive ion-selective vibrating microelectrodes were used to measure net fluxes of K+, Na+, and H+ in Zea mays root conductive tissue. Immunoreactant plant natriuretic peptides (irPNP) cause immediate net H+ influx and delayed net K+ and Na+ uptake. Delayed net K+ influx was also observed in response to 8-Br-cGMP, however, not accompanied by significant changes in net H+ fluxes. Furthermore, 8-Br-cGMP does not stimulate the plasma membrane H+-ATPase implying that cGMP directly affects cation channels. The data are consistent with NP and cGMP-dependent stimulation of nonselective cation channels with PK > PNa and point to a complex role for NPs in plant homeostasis.

Original languageEnglish (US)
Pages (from-to)53-57
Number of pages5
JournalMolecular Cell Biology Research Communications
Issue number1
StatePublished - Jul 1999
Externally publishedYes

Bibliographical note

Funding Information:
M.P. is in receipt of an AUSAID scholarship and S.N.S., I.A.N., and C.A.G. receive grant-aided support from the Australian Research Council.

ASJC Scopus subject areas

  • Molecular Biology


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