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Growth rhythm and frost hardiness dynamics in Norway spruce (Picea abies (L.) Karst.)

Westin, Johan (2000). Growth rhythm and frost hardiness dynamics in Norway spruce (Picea abies (L.) Karst.). Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Silvestria, 1401-6230
ISBN 91-576-5859-5
[Doctoral thesis]

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The seasonal growth rhythm and frost hardiness development of Norway spruce (Picea abies (L.) Karst.) in Northern Sweden were characterised in trees from local seed sources and transferred seed sources of natural and selected origins. The main aim was to clarify whether the growth performance of selected populations of local origin had a similar physiological basis to the growth performance of southern natural populations.
Populations of southern origins tended to initiate growth and dehardening later in spring, and start growth cessation and hardening later in autumn, than populations of northern origins. Populations transferred more than approximately 3 deg in latitude showed poor growth performances due to lower numbers of stem-units. Southern populations showed prolonged apical mitotic activity compared with those of northern and local origins.
Progenies of selected plus-trees showed a later start of growth and slightly later dehardening in spring. Growth cessation occurred later in juvenile seedlings of selected populations than in natural populations of similar origin. Furthermore, in non-juvenile trees of selected populations prolonged mitotic activity was observed. Needle frost hardiness levels in selected populations were similar to those of natural populations of similar origin. Selected populations of northern origins tended to produce more stem-units than natural populations of similar origin.
Throughout the studies, variation in duration of mitotic activity appeared to be unrelated to the number of stem-units produced. This was evident both among populations and among clones of similar origins. Furthermore, variation in the ability to produce stem-units could not explain variation in accumulated height growth among natural populations. Growth and hardiness performances of southern populations and of selected populations of local origin appeared, at least in part, to have a similar physiological basis i.e. delayed spring and autumn phenology.

Authors/Creators:Westin, Johan
Title:Growth rhythm and frost hardiness dynamics in Norway spruce (Picea abies (L.) Karst.)
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Silvestria
Year of publishing :2000
Number of Pages:37
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:91-576-5859-5
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:buds, frost hardiness, growth, mitotic activity, needles, Norway spruce, Picea abies, stem units
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ID Code:17775
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Genetics and Plant Physiology
Deposited By: SLUpub Connector
Deposited On:09 Oct 2020 13:51
Metadata Last Modified:05 Nov 2020 08:45

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