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Allelopathic Relationship between Yellow Birch and Sugar Maple Seedlings

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Nursery trials showed that birch seedling growth was repressed in the presence of maple seedlings despite the apparent absence of physical competition. Bioassays of leachate from actively growing maple root tips indicated the presence of substances inhibitory to birch growth. The inhibitory substances lost effectiveness after several days' storage. When maple and birch seedlings were grown together in an aerated nutrient solution, birch root growth was repressed in proportion to concentration of inhibitor detected. Exudation of the inhibitor was related to periods of rapid maple root growth but bioassays at these periods did not always detect an inhibitor. The inhibitor never caused death or necrotic tissue in birch seedlings. Forest Sci. 19: 139-145.
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Keywords: Yellow birch; competition; inhibitors; sugar maple

Document Type: Journal Article

Affiliations: Principal Plant Physiologist, North Central Forest Exp. Stn., USDA Forest Service, Northern Hardwoods Laboratory, Marquette, Mich. 49855

Publication date: 01 June 1973

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