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Heikki Hänninen (email), Paavo Pelkonen

Effects of temperature on dormancy release in Norway spruce and Scots pine seedlings.

Hänninen H., Pelkonen P. (1988). Effects of temperature on dormancy release in Norway spruce and Scots pine seedlings. Silva Fennica vol. 22 no. 3 article id 5357. https://doi.org/10.14214/sf.a15514

Abstract

Models concerning the effects of temperature on dormancy release in woody plants were tested using two-year old seedlings of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) H. Karst.). Chilling experiments suggest that the rest period has a distinct end point. Before the attainment of this end point high temperatures do not promote bud development towards dormancy release, and after it further chilling does not affect the subsequent bud development. A new hypothesis of dormancy release is suggested on the basis of a comparison between present and earlier findings. No difference in the proportion of growth commencing seedlings were detected between the forcing temperatures of 17°C and 22°C. The rest break of 50% of Norway spruce and Scots pine seedlings required six and eight weeks of chilling, respectively. Great variation in the chilling requirement was found, especially for Scots pine.

The PDF includes an abstract in Finnish.

Keywords
Pinus sylvestris; Norway spruce; Picea abies; Scots pine; bud burst; dormancy release; annual cycle of development; chilling requirement; rest period; simulation model

Published in 1988

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Available at https://doi.org/10.14214/sf.a15514 | Download PDF

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