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The Function of the Endodermis in Resistance of Virginia Pine Seedlings to Damping-Off

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Pinus virginiana seedlings were removed from the soil 15, 20, 25, 40, 50, 70, and 180 days after emergence. The roots of intact seedlings were placed on petri dish cultures of Pythium debaryanum. The upper centimeter of each root was embedded in paraffin 36 hours after inoculation, sectioned, and examined histologically. All cells exept the suberized endodermal cells and lignified vascular cells in 15- to 25-day-old roots were colonized with P. debaryanum mycelium. In roots older than 25 days, the incompletely suberized endodermis acted as a partial barrier temporarily restricting the mycelium to cells outside of the endodermis and to those directly inside of the nonsuberized portions of the endodermis. The amount of mycelium inside the endodermal layer was less in older roots where a larger number of endodermal cells were suberized. Mycelium was seldom observed penetrating the suberized endodermal cells. Nearly all tissue outside of the endodermis had been sloughed-off from 70- and 180-day-old roots ad the fully developed endodermis was the outermost layer Older roots were not infected except where secondary roots emerged.

Document Type: Journal Article

Affiliations: Assistant Professor of Plant Pathology, Botany Dept., Univ. of Maryland, College Park

Publication date: 1967-03-01

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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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 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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