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Release of Organic Materials From the Roots of Tree Seedlings

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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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Keywords: P. banksiana; P. lambertiana; P. rigida; Pinus radiata; Robinia pseudoacacia; root exudates

Document Type: Journal Article

Affiliations: Assistant Professor of Forest Pathology, School of Forestry, Yale University

Publication date: 1969-06-01

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.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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