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