Gene diversity and foreign pollen migration into a Scots pine seed orchard in northern Sweden were examined using allozyme markers. The gene diversity and fixation index varied among loci and the average values in embryos over 18 loci were 0.262 and 0.038 respectively. The observed pollen migration into the seed orchard was 30%. Two different methods were used to adjust the observed pollen migration for undetected foreign pollen. The pollen migration into the orchard after adjustment using these methods was 51% and 55% respectively. In addition, sampling procedure and other factors which can influence genetic parameters inferred from allozyme analysis are discussed.
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