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Unusually rapid growth of several coniferous species is obtainable when trees are grown from seed under extended or continuous light (24 hour photo periods). An investigation to determine the effect of continuous light on the following processes of lodgepole pine is presently underway:
1) . Graft establishment and growth.
2) Seedling growth.
3) Flower production on grafts and seedlings.
4) Early selection in advanced generations.
Germinating seed and grafts from eight selected lodgepole pine parent trees were exposed to continuous light in the greenhouse for six months. Controls were established under normal day-lengths and growing conditions.
At the end of one growing season. accelerated seedlings were 10 times taller than' control nursery seedlings of the same genetic origin. Accelerated trees were healthy. vigorous and possessed few of the juvenile characteristics associated with one-year-old seedlings. They were comparable to 2-1 or 2-2 nursery stock. A study of pot size indicated that even large containers such as the Crown-Z Dee pots are too confining to allow proper development of seedlings under continuous growth conditions. Ten-litre pots produced well-balanced seedlings.
Scion survival and growth were significantly greater for grafts grown under lights than under control conditions. The economic gain in survival and growth of lodgepole pine grafts can easily offset the cost of purchasing and powering the lights used for this experiment.
A report on flowering and early selection is not yet available.
Further information on this subject can be obtained by writing to Mr. N.C. Wheeler, Forest Service Red Rock Nursery, B.C. Ministry of Forests, R.R. #7. 15 Mile Road. Prince George. B.C. V2N 2J5.
[Abstract contains full text of memo.]
BC Forest Service - Research Division. 1977. Photo Period Extension for Growth Acceleration and Flower Promotion in Lodgepole Pine. British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development. Research Memo (FLNRORD). RM14
Topic: FLNRORD Research Program
Keywords: FLNRORD, Research Memo, British Columbia
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