Possible allelopathic constituents ofCoffea arabica
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The aqueous extracts of leaves, stems, and roots ofCoffea arabica significantly inhibited the seed germination and radicle growth of rye grass, lettuce, and fescue. When the extracts were diluted to 1% solution, significant suppression of lettuce growth was still found and was particularly pronounced in the extract of young seedlings. The paper chromato-gram of the ether fraction of an aqueous extract of coffee leaves was bioassayed with lettuce seeds and revealed a remarkable inhibition throughout the chromatogram except for the segment ofR f 0.00–0.12. Paper without spotting extract was used as a standard. The phytotoxins present in coffee tissue were identified by paper and thin-layer chro-matography and mass spectrometry. The compounds include caffeine, theobromine, theophylline, paraxanthine, scopoletin, and chlorogenic, ferulic,p-coumaric,p-hydroxybenzoic, caffeic, and vanillic acids. All compounds except caffeic acid exhibited significant phytotoxicity to lettuce growth at a concentration of 100 ppm.
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- Possible allelopathic constituents ofCoffea arabica
Journal of Chemical Ecology
Volume 6, Issue 3 , pp 643-654
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- Kluwer Academic Publishers-Plenum Publishers
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- Coffea arabica
- chlorogenic acid
- vanillic acid
- p-hydroxybenzoic acid
- caffeic acid
- ferulic acid
- p-coumaric acid
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