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The ultimate aim of most plant breeders is increased yield and one of the many methods which have been used has been the development of inbred lines with their subsequent hybridization. In addition in the course of inbreeding many interesting traits such as dwarfness can be revealed. There has been comparatively little interest in establishing inbred lines in forest trees main'ly due to the difficulties in raising enough seedlings in some species and the long intervals between each generation.
An inbreeding program with Douglas-fir (Pseudotsuga menziesii Mirb. Franco) however, was initiated in 1952 and has been continued since that date. Although this program has been on a small scale and has been delayed by the irregular production of cones and pollen at Lake Cowichan together with the requirements of other breeding programs, considerable progress has been made. Third generation inbreds have already been produced and both first and second generation inbred lines have been crossed with some success. There is no question that an inbreeding program with Douglas-fir is a feasible method of tree improvement provided that it is operated in a locality where regular cone and pollen production can be anticipated.
A Research Note No. 81 by A.L. Orr-Ewing and titled "The Collection of Douglas-Fir Inbreds at the Cowichan Lake Experiment Station, Vancouver Island" has recently been written. It gives full detaiIs complete with the appropriate maps, tables and photographs on all the inbreds and other crosses connected with inbreeding which have been planted at the Cowichan Lake Experiment Station, since 1956.
For more information write to the Forest Service Information Division, Ministry of Forests, Legislative Buildings, Victoria, B.C. V8v 1X5.
[Abstract contains full text of memo.]
BC Forest Service - Research Division. 1977. The Collection of Douglas-Fir Inbreds at the Cowichan Lake Experiment Station, Vancouver Island. British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development. Research Memo (FLNRORD). RM19
Topic: FLNRORD Research Program
Keywords: FLNRORD, Research Memo, British Columbia
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