Inhibitory effects of Hymenaea and Copaifera leaf resins on the leaf fungus, Pestalotia subcuticularis |
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Authors: | Susanne P. Arrhenius Jean H. Langenheim |
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Affiliation: | Division of Natural Sciences, University of California, Santa Cruz, CA 95064, U.S.A. |
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Abstract: | Leaf resins in the leguminous genera Hymenaea and Copaifera may play a role in restricting infection by the associated leaf fungus, Pestalotia. We tested this hypothesis by assessing growth of the geographically widespread Pestalotia subcuticularis presented with different compositions of resins. Leaf resins of Hymenaea and Copaifera are composed of the same suite of sesquiterpene hydrocarbons, but these vary quantitatively to form discrete compositional patterns among individuals and populations. Leaf resins may also contain sesquiterpene oxides; caryophyllene oxide, which may have been formed from the caryophyllene precursor common in these resins, inhibited fungal growth in vitro. |
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Keywords: | Hymenaea Copaifera Leguminosae tropical legumes leaf resins, Pestalotia Deutoromycetes leaf fungi antifungal compounds sesquiterpenes caryophyllene oxide fungal selection pressure |
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