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Pollination Mechanism and Seed Production Potential in Douglas-fir

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Receptivity of a seed cone begins with bud burst and ends with coverage of the stigmatic tips by the enlarging cone scales. Pollination efficiency was evaluated in two Douglas-fir seed orchards by observing the number of pollen grains per stigmatic tip. A total of 32 cones was observed from 5 clones over a period of 2 years. An average of 78 percent of ovules were pollinated with one or more pollen grains. Fertilization potential was evaluated by observing the number of germinated pollen grains in the micropyle. Observations on a total of 80 cones from 7 clones indicated that 70 percent of the ovules contained one or more germinated grains. Total cone scales averaged 62.3 per cone, of which 34.4 were fertile, 16.7 sterile at the proximal end, and 11.2 sterile at the distal end. Seed potential averaged 68 seeds per cone. Based on seed cone development and seed potential analysis, the most favorable period for controlled pollination appeared to be when a seed cone is three-quarters emerged from the bud scales. Forest Sci. 26:522-528.

Keywords: Pseudotsuga menziesii; cone receptivity; fertilization potential; pollination efficiency

Document Type: Journal Article

Affiliations: Western Forestry Research Center, Ontario Forest Research Centre, Maple, Ontario L0J 1E0, Canada

Publication date: December 1, 1980

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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