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Genetic Structure of a Pinus sylvestris L. Seed-Tree Stand and Naturally Regenerated Understory

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The dynamic changes in the genetic structure within a population of Pinus sylvestris have been studied by the isozyme technique. The stand investigated consisted of 122 seed trees on one hectare and was situated close to Vindeln, Sweden (lat. 64°). The study covered the genetic composition of adult trees, embryos of seeds of those trees, and the young trees below the stand. The comparison of allozyme frequence showed significant differences between different stages of the life cycle at the loci LAP-A, F-EST, and ADH-B. Genotypic frequencies in adult and young trees were close to Hardy-Weinberg expectations, but deviations were found in the embryos. An excess of homozygotes was found in the embryos at most loci compared to the young and adult populations of the seed-tree stand. The excess of homozygosity may have been due to partial self-fertilization, which gives rise to these inbred embryos. The embryos that arose through self-fertilization seem to be eliminated from the population. By the age of 10-20 the evidence of inbreeding, excess homozygosity, disappeared. The nature of the selection against selfs and its timing can not be evaluated in this study. Forest Sci. 31:430-436.

Keywords: Pinus sylvestris; isozyme marker; natural regeneration; population structure; seed-tree stand; self-fertilization

Document Type: Journal Article

Affiliations: Plant Physiology, The Swedish University of Agricultural Sciences, S-901 83 Umeå, Sweden

Publication date: 1985-06-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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