Release of Organic Materials From the Roots of Tree Seedlings
The root exudates of 18-day-old Pinus radiata D. Don, P. lambertiana Dougl., P. banksiana Lamb., P. rigida Mill., and Robinia pseudoacacia L. seedlings were analyzed by thin-layer chromatography for the presence of organic materials including carbohydrates, amino acids and amides, organic acids, vitamins, and two non-vitamin growth factors. The pine species exhibited the greatest qualitative diversity in carbohydrates, less in organic acids, and even less in amino acids. Black locust exudate contained three amino acids not present in the pine exudates. Organic acids, particularly acetic and oxalic, were released in amounts exceeding those of other metabolites. The greatest quantity of soluble compounds was released by sugar pine followed by Monterey, jack, and pitch pines, and black locust. While no root exudate materials previously unreported were found, the data suggest that meaningful qualitative and quantitative differences may exist in the exudation patterns of the five species.
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Document Type: Journal Article
Affiliations: Assistant Professor of Forest Pathology, School of Forestry, Yale University
Publication date: 1969-06-01
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- 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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