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In three Scots pine seed orchards genetic diversity as measured by the expected panmictic heterozygosity was relatively high and similar. Embryos from the Östteg and Robertsfors seed orchards showed less diversity than the parental clones. Differences in allozyme frequencies were found between the two orchards in spite of similarities in their clonal composition. Seed grading by weight had much effect on the genetic structure of embryos from the Robertsfors orchard. Embryos from heavy seed were more heterozygous than embryos from light seed.
Key words: Pinus sylvestris, seed orchards, gene diversity, allozymes
by Alfred E. Szmidt