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Plant and Cell Physiology 2004 45(8):1093-1098; doi:10.1093/pcp/pch113
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© 2004 Oxford University Press

Short Communication

A Recombinant Plant Natriuretic Peptide Causes Rapid and Spatially Differentiated K+, Na+ and H+ Flux Changes in Arabidopsis thaliana Roots

Ndiko Ludidi1, Monique Morse1, Muhammed Sayed2, Timothy Wherrett3, Sergey Shabala3 and Chris Gehring1,4

1 University of the Western Cape, Department of Biotechnology, Private Bag X17, Bellville, 7535, South Africa
2 Cambridge University, Department of Biochemistry, Tennis Court Road, Cambridge CB4 1GH, U.K.
3 University of Tasmania, School of Agricultural Science, University of Tasmania, Private Bag 54, Hobart, 7001, Australia

Abstract

Plant natriuretic peptides (PNPs) belong to a novel class of systemically mobile molecules that are structurally similar to the N-terminal domain of expansins and affect physiological processes such as protoplast volume regulation at nano-molar concentrations. Here we demonstrate that AtPNP-A, a recombinant Arabidopsis thaliana PNP causes rapid H+ influx in the elongation zone of A. thaliana roots but not in the mature zone. AtPNP-A also induces significant K+ and Na+ efflux and this effect is seen in the mature root zone only. These observations suggest that responses to AtPNP-A are developmental stage and tissue specific and point to a complex role in plant growth and homeostasis.

Footnotes

4 Corresponding author: E-mail, cgehring{at}uwc.ac.za Fax, +27-21-959-1349.


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