Autumn senescence in Populus tremula
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
The study that was conducted in this thesis confirmed that northern aspens enter into senescence earlier and the duration of their senescence period is shorter in general compared to the more southern growing aspen ecotypes. This indicates that finishing senescence faster has a high evolutionary value the further north a tree is located. The effects of girdling and the impact it had on autumn senescence were also studied. The loss of phloem transport in girdled trees resulted in that the tree accumulated sugars that promotes the tree into a much earlier senescence and also heavily increases the anthocyanin production during the senescence initiation. These effects seem to be a response to the sugar accumulation that takes place in the tree crown as a result of the girdling. Nitrogen levels were also lower in the girdled trees but the salvage efficiency of nitrogen in the leaves increased.
Place, publisher, year, edition, pages
2010. , 28 p.
IdentifiersURN: urn:nbn:se:umu:diva-37361OAI: oai:DiVA.org:umu-37361DiVA: diva2:359521
2010-03-24, KBF30, UPSC, Umeå, 13:00 (English)
UppsokLife Earth Science
Jansson, Stefan, 1959