Abstract：
: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.
journal_name
J Plant Physioljournal_title
Journal of plant physiologyauthors
Ruzvidzo O,Donaldson L,Valentine A,Gehring Cdoi
10.1016/j.jplph.2011.03.011subject
Has Abstractpub_date
2011-09-15 00:00:00pages
1710-4issue
14eissn
0176-1617issn
1618-1328pii
S0176-1617(11)00159-3journal_volume
168pub_type
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