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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
The Arabidopsis thaliana natriuretic peptide AtPNP-A is a systemic regulator of leaf dark respiration and signals via the phloem
Journal of Plant Physiology, Volume 168, No. 14, Year 2011
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Description
Plant natriuretic peptides (PNPs) belong to a novel class of peptidic signaling molecules that share some structural similarity to the N-terminal domain of expansins and affect physiological processes such as water and ion homeostasis at nano-molar concentrations. Here we show that a recombinant Arabidopsis thaliana PNP (AtPNP-A) rapidly increased the rate of dark respiration in treated leaves after 5 min. In addition, we observed increases in lower leaves, and with a lag time of 10 min, the effect spread to the upper leaves and subsequently (after 15 min) to the opposite leaves. This response signature is indicative of phloem mobility of the signal, a hypothesis that was further strengthened by the fact that cold girdling, which affects phloem but not xylem or apoplastic processes, delayed the long distance AtPNP-A effect. We conclude that locally applied AtPNP-A can induce a phloem-mobile signal that rapidly modifies plant homeostasis in distal parts. © 2011 Elsevier GmbH.
Authors & Co-Authors
Ruzvidzo, Oziniel
South Africa, Bellville
University of the Western Cape
Donaldson, Lara
South Africa, Bellville
University of the Western Cape
Saudi Arabia, Thuwal
King Abdullah University of Science and Technology
Valentine, Alex J.
South Africa, Stellenbosch
Stellenbosch University
Gehring, Chris A.
Saudi Arabia, Thuwal
King Abdullah University of Science and Technology
Statistics
Citations: 28
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1016/j.jplph.2011.03.011
ISSN:
01761617
Research Areas
Environmental