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Title: Analyses of gene diversity in some species of conifers

Author: Yeh, Francis C.;

Date: 1981

Source: Gen. Tech. Rep. PSW-GTR-48. Berkeley, CA: Pacific Southwest Forest and Range Exp. Stn, Forest Service, U.S. Department of Agriculture: p. 48-52

Publication Series: General Technical Report (GTR)

   Note: This article is part of a larger document. View the larger document

Description: Genetic variation at 21 to 25 loci in extracts of individual megagametophytes was surveyed in Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco), Sitka spruce (Picea sitchensis [Bong.] Carr.) and lodgepole pine (Pinus contorta ssp. latifolia [Engelm.] Critchfield). The overall mean proportion of polymorphic loci was 61.19 percent, and the overall mean heterozygosity per individual was 15.81 percent. Sitka spruce was on the low side and interior Douglas-fir on the high side of overall mean genetic variation. Distribution of loci relative to frequency of heterozygotes was rather even for heterozygosities between 0.05 and 0.60: however, between 38 to 56 percent of the loci had heterozygosities lower than 0.05. More than 90 percent of the total gene diversity resided within populations. Although subpopulations were differentiated by only 2.6 to 7.9 percent, level of population subdivision was considered significant for the species tested. The overall pattern of genetic differentiation agreed with the expected on the basis of the neutral-mutation theory. Some loci, however, demonstrated conspicuous clinal variation patterns that are not readily compatible with this stochastic model.

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Yeh, Francis C. 1981. Analyses of gene diversity in some species of conifers. Gen. Tech. Rep. PSW-GTR-48. Berkeley, CA: Pacific Southwest Forest and Range Exp. Stn, Forest Service, U.S. Department of Agriculture: p. 48-52

 


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