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Variation in Tolerance of American Elm to the Verticillium Wilt Fungus

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American elm seedlings vary widely in amount of shoot elongation after inoculation with the Verticillium wilt fungus. This experiment tested the hypothesis that variation in tolerance to the fungus is inherent. Five hundred and ninety-four inoculated seedlings produced an array of seedling heights suggesting that host response ranged from high to low susceptibility. Seedlings from 5 different segments of the array were vegetatively propagated and inoculated to verify initial host response. Comparison of stem elongation for 10 fungus-treated and 10 control ramets per clone revealed that for some clones, fungal inoculation produced negligible growth suppression. For other clones, growth suppression was marked. These responses illustrate genetic variation in tolerance to the fungus. Growth response of an individual clone did not necessarily correspond to growth response of the selected seedling from which the clone was produced. Clonal testing is required for identification of elm genotypes that tolerate this fungus. Forest Sci. 21:227-231.
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Keywords: Ulmus americana; Verticillium albo-atrum; disease resistance; genetic variation

Document Type: Journal Article

Affiliations: Associate Professor, Department of Forestry, University of Wisconsin, Madison WI 53706

Publication date: 1975-09-01

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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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