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Karyotypes in the Genus Pseudotsuga

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Previous investigators have shown that P. menziesii has a haploid chromosome number of 13, and both P. macrocarpa and P. wilsoniana have haploid numbers of 12. This study shows that each of the other three species, P. japonica, P. sinensis, and P. forrestii, has 12 haploid chromosomes, indicating that the basic number of chromosomes in the genus Pseudotsuga is 12. This adds to the evidence that P. menziesii with an n-number of 13 arose from a species with 12. Intraspecific hybridization would be a more fruitful approach to a breeding program for P. menziesii than would interspecific crossing. Forest Sci. 18:66-69.

Keywords: Chromosome; Douglas-fir; tree breeding

Document Type: Journal Article

Affiliations: Forest Geneticist, School of Forestry, Oregon State University, Corvallis 97331

Publication date: March 1, 1972

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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