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Effect of Photoperiod and Light Quality on Germination of Douglas-Fir Seed

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The rate of germination of unstratified seed of Pseudotsuga menziesii (Mirb.) Franco was increased significantly by interruption of the dark period with two hours of white light compared with the rate obtained without interruption of the dark period but with the same total amount of light per 24-hour cycle. This effect disappeared at temperatures above 25°C. Exposure of unstratified seed to red light during the dark periods for various lengths and number of periods increased the rate of germination, while similar exposures to far-red light decreased the rate. The effects of red and far-red light were reversible. Exposure of dry seed to red light for 12 hrs followed by imbibition and germination in the dark also increased the rate of germination but only if the seeds were kept in total darkness after the exposure.
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Document Type: Journal Article

Affiliations: Assistant Professor, School of Forestry, Oregon State Univ., Corvallis

Publication date: 1964-06-01

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.

    2016 Impact Factor: 1.782 (Rank 17/64 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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