Seed Germination of Fraser Fir: Timing of Irradiation and Involvement of Phytochrome

in Journal of the American Society for Horticultural Science
Authors:
Paul H. HenryDepartment of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609

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Frank A. BlazichDepartment of Horticultural Science, North Carolina State University, Raleigh, NC 27695-7609

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Two experiments investigated the relationship of light and temperature in seed germination of Fraser fir [Abies fraseri (Pursh) Poir.]. Irradiation during the warm portion of 9/15 hr thermoperiod of 20/10C and 30/20C increased germination percentages after 42 days, and the degree of stimulation depended on the timing of the light exposures. A 1-hr exposure was most effective during the latter part of the warm portion of the thermoperiods, and varying the time of irradiation had the greatest effect at 20/10C. The involvement of phytochrome in this photomorphogenic response was ascertained by demonstration of red/far-red reversibility.

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