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Testing of Redwood Seed for Silvicultural Research by X-Ray Photography

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Seed of Sequoia sempervirens not only is low in viability but also defies all conventional methods of seed cleaning, creating serious obstacles to seeding studies where seed samples of high and accurately known viability are essential. Through use of radiography one can obtain such samples. In addition, insight into the condition of redwood seed lots, readily obtainable by radiographs, permit greatly improved approaches to a variety of other silvicultural problems involving redwood seed. Of the 50 seeds from each of 7 seed lots tested, 58 to 99 percent fell into the class "without discernible embryo." Such seed may be "empty" or "tannin filled." From 1 to 42 percent of the seeds fell into the class "with discernible embryo." Of these, one-fourth showed symptoms of pathogenic infection.

Document Type: Journal Article

Affiliations: Associate Specialist in Forestry and Professor of Forestry, School of Forestry, Univ. of Calif., Berkeley

Publication date: 1963-12-01

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

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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