Dormancy induction in container-grown Abies seedlings: Effects of environmental cues and seedling age |
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Authors: | Chao-Hsiung Tung David R Deyoe |
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Institution: | (1) Science Applications International Corporation, 101 Convention Center Drive, Suite 407, 89109 Las Vegas, NV, USA;(2) Forest Resources Group, Ministry of Natural Resources, 258 Queen Street, P.O. Box 1000, P6A 5N5 Sault Ste. Marie, Ontario, Canada |
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Abstract: | Twelve-week-old container-grown seedlings of noble fir (Abies procera Rehd.) and Shasta red fir (A. magnifica A. Murr. var. shastensis Lemm.), both high-elevation species, were grown under controlled environments in a study of induction of terminal-bud dormancy. Eight treatment combinations of long (15 h) or short (11 h) photoperiods, warm (25°/20°C) or cool (18°/12°C) thermoperiods, and dry (–1.2 MPa) or wet (–0.6 MPa) moisture regimes were imposed upon seedlings for 12 weeks. Treatment factors significantly affecting the induction of dormancy in terminal buds of seedlings were identified over time. The results suggest that seedlings responded dynamically to dormancy cues. The warm/dry and cool/wet combinations induced dormancy in the first 2 weeks in noble fir and in the first week in Shasta red fir. Short-day/warm and long-day/cool combinations enhanced dormancy induction in weeks 3 to 4 in noble fir and in weeks 1 to 7 in Shasta red fir. Short days and cool thermoperiods independently hastened dormancy induction in noble fir in weeks 5 through 12. |
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Keywords: | moisture regime noble fir photoperiod Shasta red fir thermoperiod |
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