Girdling interruption between source and sink in Quercus pubescens does not trigger leaf senescence

Author(s)
V. Holland, L. Fragner, T. Jungcurt, W. Weckwerth, W. Brueggemann
Abstract

Metabolite changes and senescence behaviour after mechanical phloem girdling were studied in leaf tissue of Quercus pubescens. Sugar accumulation is not only considered to be an important part of several developmental signalling pathways, but is also seen as one of the basic triggers for senescence induction, or at least an obligatory accessory phenomenon. Our survey showed that an accumulation of the soluble sugars, glucose and fructose, was not on its own obligatorily connected with the induction of leaf senescence, since no indication or even an onset of senescence could be observed during the course of the experiment. Instead, we observed an inhibition of leaf development with a decrease of photosynthesis and a slow-down of development in nearly all chlorophyll a fluorescence analysis parameters using the JIP-test. We detected a change of metabolites linked to oxidative stress, possibly due to an overexcitation of the developmentally inhibited photosynthetic apparatus.

Organisation(s)
Department of Ecogenomics and Systems Biology, Large-Instrument Facility for Mass Spectrometry in Life Sciences, Research Platform Vienna Metabolomics Center
External organisation(s)
Senckenberg Forschungsinstitut und Naturmuseum, Johann Wolfgang Goethe-Universität Frankfurt am Main
Journal
Photosynthetica
Volume
54
Pages
589-597
No. of pages
9
ISSN
0300-3604
DOI
https://doi.org/10.1007/s11099-016-0646-3
Publication date
12-2016
Peer reviewed
Yes
Austrian Fields of Science 2012
Genomics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/girdling-interruption-between-source-and-sink-in-quercus-pubescens-does-not-trigger-leaf-senescence(febfbdbc-4835-470f-9854-ee866bcbe604).html