Cold storage increases resistance to dehydration stress in Pacific Douglas-Fir


Seedlings of coastal California Douglas-fir grown at the Humboldt Nursery were lifted in January and February and investigated for the effects of a standard dehydration stress applied either before or after cold storage or both. Survival potential and top and root growth capacities of stressed and unstressed seedlings were evaluated in a greenhouse in May, and field survival and growth were determined on a nearby planting site. Survival potential averaged 53 percent for seedlings stressed before storage in January, compared to 97 percent for seedlings stressed after storage. The survival potentials, growth capacities, and field performances of seedlings stressed after storage approximated those of unstressed seedlings. Apparently, seedlings stored in midwinter doubled their resistance to dehydration stress during storage, and seedlings stored in late winter maintained their high resistance. The evidence suggests that, for sources from northern California and southwestern Oregon, stress tests to evaluate survival potentials of Humboldt planting stock should be done after cold storage, shortly before spring planting, if at all.
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Publication Forest Nursery Proceedings
Event Coeur d'Alene, ID - 1984
Author James L. Jenkinson and James A. Nelson
Published 1985/06/01
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