Allelopathic actions in the Florida scrub community |
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| Authors: | N H Fischer G B Williamson N Tanrisever Ana de la Pena J D Weidenhamer Elizabeth D Jordan D R Richardson |
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| Institution: | (1) Department of Chemistry, Louisiana State University, 70803 Baton Rouge, LA, USA;(2) Department of Botany, Louisiana State University, 70803 Baton Rouge, LA, USA |
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| Abstract: | The hypothesis that allelochemicals released from members of the Florida scrub community deter the invasion of fire-prone
sandhill grasses was investigated. Constituents of the endemic scrub members, Ceratiola ericoides, Conradina canescens and
Calamintha ashei, were examined for their phytotoxic activity. Effects of the plant natural products on the germination and
radicle growth of lettuce (Lactuca sativa), as well as little bluestem (Schizachyrium scoparium) and green sprangletop (Leptochloa
dubia), two native grasses of the Florida sandhill community, were tested.
The data suggest that ursolic acid and other natural detergents which are released from a source plant enhance the solubilization
of allelopathic lipids via micellization. In general, natural surfactants seem to play a significant role in the water transport
of lipophilic phytotoxins to target seeds or seedlings. |
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