Skip to main content

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

Buy Article:

$29.50 plus tax (Refund Policy)


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.

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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
  • Submit a Paper
  • Membership Information
  • Author Guidelines
  • Podcasts
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more