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Nitrogenous Compounds in the Xylem Sap of Ulmus americana: Seasonal Variations in Relation to Dutch Elm Disease Susceptibility

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Amino acid concentrations in the xylem sap of Ulmus americana L. decreased gradually from early spring to summer. Twenty amino acids, ammonia, -amino-n-butyric acid, ethanol-amine, and -alanine were always present. Asparagine + glutamine constituted the most abundant organic nitrogenous components in the xylem sap during June when elms in Wisconsin are most susceptible to Dutch elm disease. Proline was present only in the sap samples collected during May, and disappeared in early June with the onset of susceptibility to Dutch elm disease. Ammonia was present in high concentration; and ornithine, lysine, histidine, ethanolamine, arginine, glycine, methionine, isoleucine, leucine, tyrosine, and phenylalanine were present in measurable amounts during May and early June, but all declined to small amounts in later months.
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Keywords: Amino acids; Ceratocystis ulmi

Document Type: Journal Article

Affiliations: Associate Professor of Plant Pathology and Forestry, University of Wisconsin, Madison

Publication date: 1969-09-01

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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.
    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
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