Journal Article

Effects of photoperiod and temperature on the timing of bud burst in Norway spruce (<i>Picea abies</i>)

Jouni Partanen, Veikko Koski and Heikki Hänninen

in Tree Physiology

Volume 18, issue 12, pages 811-816
Published in print December 1998 | ISSN: 0829-318X
Published online December 1998 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/18.12.811
Effects of photoperiod and temperature on the timing of bud burst in Norway spruce (Picea abies)

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We examined the effects of several photoperiod and temperature regimes imposed during the winter–spring period on the timing of bud burst in rooted cuttings of Norway spruce (Picea abies (L.) Karst.) grown in a greenhouse in Finland. The treatments were initiated in November and December after the cuttings had been exposed to natural chilling and freezing events. Irrespective of the treatments applied, time to bud burst decreased with increased duration of previous exposure to natural chilling and freezing events. Fluctuating day/night temperatures and continuous lengthening of the photoperiod hastened bud burst. Shortening the photoperiod delayed bud burst, suggesting that little or no ontogenetic development toward bud burst takes place during mild periods before the winter solstice. In the case of climatic warming, this phenomenon may prevent the premature onset of growth that has been predicted by computer simulations with models that only consider temperature regulation of bud burst.

Keywords: climate change; phenology; premature onset of growth

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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