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Journal of Chemical Ecology

, Volume 20, Issue 6, pp 1355–1380 | Cite as

In search of allelopathy in the Florida scrub: The role of terpenoids

  • Nikolaus H. Fischer
  • G. Bruce Williamson
  • Jeffrey D. Weidenhamer
  • Donald R. Richardson
Article

Abstract

The hypothesis was tested that allelopathic agents released from fire-sensitive plants of the Florida scrub community deter the invasion of fireprone sandhill grasses. The structures of the constituents of four endemic scrub species,Conradina canescens, Calamintha ashei, Chrysoma pauciflosculosa, andCeratiola ericiodes, were established and their phytotoxic activity against two grasses of the sandhill was examined. Effects of the secondary metabolites from the above scrub species and their degradation products upon the germination and radicle growth of little bluestem (Schizachyrium scoparium) and green sprangletop (Leptochloa dubia), two native grasses of the Florida sandhill community, were determined. The studies included determination of the water solubility and release mechanism of terpenes and other allelopathic agents from the source plants and their aqueous transport to the target species. Some of the natural products were nontoxic until activated by light and/or oxidation after release from the source plant into the environment.

Key Words

Calamintha ashei (Labiatae) Conradina canescens (Labiatae) Chrysoma pauciflosculosa (Asteraceae) Ceratiola ericiodes (Empetraceae) terpenoids allelopathy mechanisms of release water transport activation 

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Copyright information

© Plenum Publishing Corporation 1994

Authors and Affiliations

  • Nikolaus H. Fischer
    • 1
  • G. Bruce Williamson
    • 2
  • Jeffrey D. Weidenhamer
    • 3
  • Donald R. Richardson
    • 2
  1. 1.Department of ChemistryLouisiana State UniversityBaton Rouge
  2. 2.Department of BotanyLouisiana State UniversityBaton Rouge
  3. 3.Department of ChemistryAshland UniversityAshland

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