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

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Abstract:

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: December 1, 1963

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