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