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- Title
Girdling interruption between source and sink in Quercus pubescens does not trigger leaf senescence.
- Authors
Holland, V.; Fragner, L.; Jungcurt, T.; Weckwerth, W.; Brüggemann, W.
- 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.
- Subjects
QUERCUS pubescens; METABOLITE synthesis; LEAF aging; TREE girdling; PLANTS; OXIDATIVE stress; CHLOROPHYLL spectra; GENETICS of aging
- Publication
Photosynthetica, 2016, Vol 54, Issue 4, p589
- ISSN
0300-3604
- Publication type
Article
- DOI
10.1007/s11099-016-0646-3