Abstract
Overhead-cooling treatment used to delay flowering produced non-significant effects on germination capacity, germination rate, germination value, and abnormal germination of seeds from a 13-year-old Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] seedling seed orchard. The percentage of variation accounted for by cooling treatment ranged from 0.0 to 1.0%. In contrast, variation among trees within treatments ranged from 28 to 46%. These effects were significant, indicating that each tree has an individual germination pattern. The temporal delay of reproductive phenology caused by temperature manipulation as a result of the cooling treatment was judged to be within the species' biological limits.
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El-Kassaby, Y.A., Edwards, D.G.W. & Taylor, D.W. Effect of water-spray cooling treatment in a Douglas-fir seed orchard on seed germination. New Forest 4, 137–146 (1990). https://doi.org/10.1007/BF00119006
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DOI: https://doi.org/10.1007/BF00119006