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.
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Dedicated to one of the pioneers in allelopathy, Cornelius H. Muller.
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Fischer, N.H., Williamson, G.B., Weidenhamer, J.D. et al. In search of allelopathy in the Florida scrub: The role of terpenoids. J Chem Ecol 20, 1355–1380 (1994). https://doi.org/10.1007/BF02059812
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DOI: https://doi.org/10.1007/BF02059812