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Metsätieteen aikakauskirja Dissertationes Forestales Suo - Mires and Peat
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Full text of this article is only available in PDF format.

Marja-Leena Valkonen (email), Heikki Hänninen, Paavo Pelkonen, Tapani Repo

Frost hardiness of Scots pine seedlings during dormancy.

Valkonen M.-L., Hänninen H., Pelkonen P., Repo T. (1990). Frost hardiness of Scots pine seedlings during dormancy. Silva Fennica vol. 24 no. 4 article id 5433. https://doi.org/10.14214/sf.a15587

Abstract

The relationships between bud dormancy and frost hardiness were examined using two-year-old Pinus sylvestris L. seedlings. The chilling temperatures used were +4 and -2°C. To examine the dormancy release of the seedlings, a forcing technique was used. Frost hardiness was determined by artificial freezing treatments and measurements of electrical impedance. At the start of the experiment, the frost hardiness of the seedlings was about -25°C. After the rest break, the seedlings kept at +4°C dehardened until after eight weeks their frost hardiness reached -5°C. At the lower chilling temperature (-2°C) the frost hardiness remained at the original level. When moved from +4 to -2°C, seedlings were able to reharden only after the time required for bud burst in the forcing conditions had reached the minimum.

The PDF includes an abstract in Finnish

Keywords
Pinus sylvestris; frost hardiness; cold hardiness; annual cycle; chilling requirements; bud dormancy; rest

Published in 1990

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Available at https://doi.org/10.14214/sf.a15587 | Download PDF

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