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Occurrence of Root Pressure Exudation in Pacific Northwest Conifer Seedlings

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Exudation was observed from the stumps of detopped seedlings of Pseudotsuga menziesii, Abies grandis, Abies procera, Abies amabilis, Pinus ponderosa, Pinus contorta, Picea engelmannii, and Larix occidentalis. Exudation occurred both from seedlings with completely suberized root systems and from seedlings with various amounts of new root growth, and persisted up to 79 days. Exudate osmotic potentials ranged from -0.24 to -0.78 bar. Long-term cold storage of the seedlings is thought to be the major factor stimulating exudation in these seedlings. Forest Sci. 26:275-279.

Keywords: Abies amabilis; Abies grandis; Abies procera; Larix occidentalis; Picea engelmannii; Pinus contorta; Pinus ponderosa; Pseudotsuga menziesii

Document Type: Journal Article

Affiliations: Principal Plant Physiologist, Pacific Northwest Forest and Range Experiment Station, USDA Forest Service, Wenatchee, WA 98801

Publication date: June 1, 1980

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