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Abundant Natural Hybridization Between Austrian and Japanese Red Pines in Southern Michigan

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Several dozen natural hybrids occur near a 34-year-old plantation of Austrian pine situated near a plantation of Japanese red pine at the W. K. Kellogg Forest in southern Michigan. The oldest hybrid was 26 feet tall at age 18 and had some 3-foot internodes. The hybrids were intermediate in leaf and cone characters. From 1962 to 1964, a total of 2,169 open-pollinated cones was collected from the Austrian pines. The average yield was 26 sound seeds per cone. The seedlings were grown in comparison with pure Austrian and pure Japanese red pines. At age 4, 92 percent were identified as hybrid on the basis of rapid growth, presence of 3-needled fascicles, shorter and less stiff needles than in the female parent, and presence of female flowers. Pines are polyembryonic, and it is likely that the high incidence of hybrids is the result of early heterosis and selection favoring hybrid embryos during the course of seed development. The hybrid may find future use for timber production and roadside plantings.

Keywords: Heterosis; zygote selection

Document Type: Journal Article

Affiliations: Conservation Aide, Mich. Dept. of Conservation, and Research Associate, Mich.

Publication date: September 1, 1969

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  • 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
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