Comparison of Four Cold Hardiness Tests on Three Western Conifers


Container-grown ponderosa pine, Douglas-fir, and Engelmann spruce seedlings were cold acclimated and deacclimated in growth chambers over 19 weeks. A wholeplant freeze test and three tissue tests were performed weekly. The whole-plant freeze test provided results in 7 days and indicated differences in cold hardiness between stems, buds, and needles. Results from a freeze-induced electrolyte leakage test and differential thermal analysis were available in 2 days and 1 hour, respectively. Both tests were good predictors of tissue cold hardiness when calibrated against the whole-plant freeze test. Ethylene and ethane evolution were poor predictors of the development of cold hardiness.
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Publication Forest Nursery Proceedings
Event Tumwater, WA - 1986
Author Karen E. Burr, Richard W. Tinus, Stephen J. Wallner, and Rudy M. King
Published 1986/08/12
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