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Drought Tolerance of Southwestern Oregon Douglas-Fir

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Seedlings from two open-pollinated families of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) from each of 35 seed sources in southwestern Oregon were tested for their ability to survive simulated drought in growth room, greenhouse, and coldframe test environments. Generally, seedlings from seed sources originating from higher elevations and, to a lesser extent, from drier sites, were more drought tolerant. Seedlings from drought-tolerant sources tended to have earlier bud-set, smaller initial height, and less winter injury. The main selective force leading to earlier bud-set and smaller height growth appeared to be the colder temperature regime associated with higher elevations. Seedlings from high elevations entered dormancy sooner and were better able to survive the imposed drought. Implications for seed transfer and for breeding for drought-tolerant genotypes in southwestern Oregon are discussed. For. Sci. 33(2):283-293.

Keywords: Provenance variation; clinal models; genetic correlations; phenology

Document Type: Journal Article

Affiliations: Associate Professor, Department of Forestry, University of Florida, Gainesville, FL 32611

Publication date: June 1, 1987

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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