Journal Article

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

Ndiko Ludidi, Monique Morse, Muhammed Sayed, Timothy Wherrett, Sergey Shabala and Chris Gehring

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 45, issue 8, pages 1093-1098
Published in print August 2004 | ISSN: 0032-0781
Published online August 2004 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pch113
A Recombinant Plant Natriuretic Peptide Causes Rapid and Spatially Differentiated K+, Na+ and H+ Flux Changes in Arabidopsis thaliana Roots

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  • Biochemistry
  • Molecular and Cell Biology
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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.

Keywords: Keywords: Arabidopsis thaliana — Expansin — Homeostasis — Ion flux — Plant natriuretic peptide.; Abbreviations: PNP, plant natriuretic peptide; ANP, atrial natriuretic peptide.

Journal Article.  4227 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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