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Natriuretic Peptides and cGMP Modulate K+, Na+, and H+ Fluxes in Zea mays Roots


Pharmawati, M and Shabala, SN and Newman, IA and Gehring, CA, Natriuretic Peptides and cGMP Modulate K+, Na+, and H+ Fluxes in Zea mays Roots, Molecular Cell Biology Research Communications, 2, (1) pp. 53-57. ISSN 1522-4724 (1999) [Refereed Article]

DOI: doi:10.1006/mcbr.1999.0151


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. © 1999 Academic Press.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Medical and biological physics
Research Field:Biological physics
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the environmental sciences
UTAS Author:Shabala, SN (Professor Sergey Shabala)
UTAS Author:Newman, IA (Dr Ian Newman)
ID Code:17410
Year Published:1999
Deposited By:Physics
Deposited On:1999-08-01
Last Modified:2011-11-21

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