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dc.contributor.authorRuzvidzo, Oziniel
dc.contributor.authorDonaldson, Lara Elizabeth
dc.contributor.authorValentine, Alex J.
dc.contributor.authorGehring, Christoph A
dc.date.accessioned2015-08-03T09:32:28Z
dc.date.available2015-08-03T09:32:28Z
dc.date.issued2011-09
dc.identifier.issn01761617
dc.identifier.pmid21550130
dc.identifier.doi10.1016/j.jplph.2011.03.011
dc.identifier.urihttp://hdl.handle.net/10754/561851
dc.description.abstractPlant 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.
dc.publisherElsevier BV
dc.subjectDark respiration
dc.subjectHomeostasis
dc.subjectPhloem
dc.subjectPlant natriuretic peptides
dc.subjectSystemic response
dc.titleThe Arabidopsis thaliana natriuretic peptide AtPNP-A is a systemic regulator of leaf dark respiration and signals via the phloem
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentBioscience Program
dc.contributor.departmentMolecular Signalling Group
dc.identifier.journalJournal of Plant Physiology
dc.contributor.institutionDepartment of Biotechnology, University of the Western Cape, Bellville 7535, South Africa
dc.contributor.institutionDepartment of Botany and Zoology, Faculty of Science, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa
kaust.personDonaldson, Lara Elizabeth
kaust.personGehring, Christoph A


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