In three Scots pine seed orchards genetic diversity as measured by the expected panmictic heterozygosity was relatively high and similar. Embryos from Östteg and Robertsfors showed less diversity than the parental clones. Differences in allozyme frequencies were found between some orchards in spite of similarities in their clonal composition. Seed grading had much effect on the genetic structure of embryos from Robertsfors. Embryos from heavy seed were more heterozygous than embryos from light seed.
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