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The Journal of Heredity 1988:79(6):453-458
© 1988 The American Genetic Association 79:453-458

research-article

Ribosomal Gene Number Variability in Douglas-Fir

S. H. Strauss, and C.-H. Tsai

Department of Forest Science, Oregon State University Corvallis

Address reprint requests to Dr. Strauss, Department of Forest Science, Oregon State University, Corvallis, OR 97331-5705.

Abstract

We studied genetic variability for the number of copies of nuclear ribosomal RNA genes in 54 trees derived from seed collected throughout most of the natural range of Douglas-fir (Pseudotsuga menziesll [Mirb.] Franco). Slot-blots were hybridized with a radiolabeled heterologous ribosomal gene probe, and the relative gene number was estimated from densitometer scans of the resulting autoradiographs. Genetic variability for ribosomal gene number was substantial and resided almost entirely within populations; variance among trees accounted for half the total variance. Gene number increased with latitude, elevation, and longitude. The tendency for gene number to increase northward concurs with cllnes reported for genome size in Douglas-flr, in other conifers, and among wild and cultivated herbaceous plant species.


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