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Autumn senescence in Populus tremula
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC).
2010 (Engelska)Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
Abstract [en]

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.

Ort, förlag, år, upplaga, sidor
2010. , s. 28
Nationell ämneskategori
Botanik
Identifikatorer
URN: urn:nbn:se:umu:diva-37361OAI: oai:DiVA.org:umu-37361DiVA, id: diva2:359521
Presentation
2010-03-24, KBF30, UPSC, Umeå, 13:00 (Engelska)
Uppsök
bio-/geovetenskap
Handledare
Tillgänglig från: 2010-10-28 Skapad: 2010-10-28 Senast uppdaterad: 2015-04-29Bibliografiskt granskad

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Olofsson, Erik
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Institutionen för fysiologisk botanikUmeå Plant Science Centre (UPSC)
Botanik

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