Aronsson, Aron
(1975).
Influence of photo- and thermoperiod on the initial stages of frost hardening and dehardening of phytotron-grown seedlings of Scots pine (Pinus silvestris L.) and Norway spruce (Picea abies (L.) Karst.).
Technical Report.
Stockholm:
Predecessors to SLU > Royal School of Forestry, Sveriges lantbruksuniversitet.
Studia forestalia Suecica
; 128
[Report]
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Abstract
Seedlings of Pinus silvestris (L.) and Picea abies ((L.) Karst.), 16 weeks old, were hardened under various photo- and thermoperiods. Dehardening after a period of chilling was followed by exposure to various temperatures under long and short day conditions. The degree of frost hardiness of the seedlings was determined in freezing tests at -7°, - 11° and - 17°C. Damage caused by freezing was evaluated by measurement of conductivity. Short day conditions were of importance to hardening in both species, the most effective photoperiods being 6-12 hours. Shorter photoperiods (2-4 hours) were less effective. Low temperatures did not cause hardening under long-day conditions, but increased hardiness under short photoperiods, especially in pine. Night temperature had a greater influence on hardening in pine than did day temperature. Dehardenirng appeared to depend more on temperature than on photoperiod. Dehardening was a much faster process than hardening.
Authors/Creators: | Aronsson, Aron |
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Title: | Influence of photo- and thermoperiod on the initial stages of frost hardening and dehardening of phytotron-grown seedlings of Scots pine (Pinus silvestris L.) and Norway spruce (Picea abies (L.) Karst.) |
Series Name/Journal: | Studia forestalia Suecica |
Year of publishing : | 1975 |
Number: | 128 |
Number of Pages: | 20 |
Place of Publication: | Stockholm |
Publisher: | Skogshögskolan |
ISBN for printed version: | 91-38-02564-7 |
ISSN: | 0039-3150 |
Language: | English |
Publication Type: | Report |
Full Text Status: | Public |
Subjects: | Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Plant breeding Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Forestry |
Keywords: | photoperiod, thermoperiod, frost hardening, dehardening, phytotron, seedlings, Pinus silvestris, Picea abies, temperature relations |
URN:NBN: | urn:nbn:se:slu:epsilon-9-71 |
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-9-71 |
ID Code: | 5647 |
Department: | Predecessors to SLU > Royal School of Forestry |
Deposited By: | Skogsbiblioteket Umeå |
Deposited On: | 07 Feb 2011 00:00 |
Metadata Last Modified: | 13 Nov 2015 14:08 |
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