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The Journal of Heredity 1994:85(3):227-231
© 1994 The American Genetic Association 85:227-231

other

Mixed Mating in an Experimental Population of Western Red Cedar, Thuja plicata

Y. A. El-Kassaby, J. Russell, and K. Ritland

Pacific Forest Products Limited, Saanich Forestry Centre 8067 East Saanich Road, RR 1, Saanichton, B.C. V0S 1M0, Canada
British Columbia Ministry of Forests, Cowichan Lake Research Station, Mesachie Lake B.C., Canada
The Department of Botany, University of Toronto Toronto, Canada

Address reprint requests to Y. A. El-Kassaby at the Saanich Forestry Centre

Abstract

An outcrossing rate of 32% was found in a seed-orchard population of western red cedar (Thuja plicata) located on Vancouver Island, British Columbia. This is the lowest outcrossing rate reported for any conifer, in either experimental or natural stands. In addition, this study (and another) shows that western red cedar has one-half to one-fourth of the isozyme heterozygosity of other representative conifers. Paleobotanical records indicate this species experienced a severe bottleneck of population size between 10,000 and 6,000 years BP. This bottleneck may have been responsible for these low levels of heterozygosity, which in turn may have decreased levels of inbreeding depression, allowing tolerance of this relatively high level of selfing.


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