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.).
Faculty of Forest Sciences, Sveriges lantbruksuniversitet.
Studia forestalia Suecica
Official URL: http://www-umea.slu.se/bibum/studia/
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.
|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/Journal:||Studia forestalia Suecica (0039-3150)|
|Year of publishing :||1975|
|Number of Pages:||20|
|Place of Publication:||Stockholm|
|Full Text Status:||Public|
|Subjects:||ZZZ Don't use any more: Subject categories for Swedish research publications > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Plant breeding|
ZZZ Don't use any more: Subject categories for Swedish research publications > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Forestry
|Keywords:||photoperiod, thermoperiod, frost hardening, dehardening, phytotron, seedlings, Pinus silvestris, Picea abies, temperature relations|
|Divisions:||Faculty of Forest Sciences|
|Deposited By:||Skogsbiblioteket Umeå|
|Deposited On:||07 Feb 2011 00:00|
|Metadata Last Modified:||03 May 2013 08:04|
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