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Early Root Development and Anatomical Parasite-Host Relationships of Black Senna with Slash Pine

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Field observations during 3 growing seasons revealed that black senna, a parasitic annual, attacks all ages of slash, longleaf, and loblolly pines in plantations and natural stands. It was not observed on natural sites lacking pine. Germination occurs when pine is absent but epicotyl elongation was not observed except in vitro. Following epigeous germination, roots penetrate the soil, grow geotropically, and contact pine roots producing multiple secondary haustoria composed of parenchymatous and vascular tissue. These generate intrusive organs which penetrate and ramify throughout the cortex of the host root. Branching vascular tissues penetrate the pine xylem cylinder by way of xylary rays and enter host tracheids through bordered pits. Modified terminal structures within the pine tracheids are adapted for uptake of water and nutrients. Black senna tissue within the host root may damage transport systems and reduce pine growth following severe attack. Forest Sci. 21:239-242.
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Keywords: Scrophulariaceae; Senna seymeria; Seymeria cassioides; hemiparasite; obligate parasite

Document Type: Journal Article

Affiliations: Research Forester, Southeastern For. Exp. Sta., USDA Forest Service, Athens, GA 30601

Publication date: 1975-09-01

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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