Allelochemicals fromPolygonum sachalinense Fr. Schm. (Polygonaceae)
- 181 Downloads
The root exudates fromPolygonum sachalinense in a recirculating system significantly inhibited lettuce seedling growth. The rhizomes and roots ofP. sachalinense were extracted with 80% acetone. Bioassay of the neutral-acidic fraction on the TLC agar plate showed the inhibitory activity corresponded to the two yellow pigment bands. Two orange needles were isolated and identified as anthraquinone compounds: emodin and physcion. Both compounds exhibited inhibitory activities against the seedling growth of several testing plant species. Glucosides were isolated fromP. sachalinense and were identified as emodin-1-O-β-D-glucoside and physcion-1-O-β-D-glucoside, respectively. On plant growth bioassay, these glucosides showed no phytotoxic activity against lettuce seedlings. The concentrations of emodin, physcion, and their glucosides from rhizome with roots, aerial parts, fallen leaves, and soil were determined. The rhizome with roots and fallen leaves contained emodin and physcion at relatively high concentrations. Emodin also occurs in the soil of this plant community with effective concentrations in the fall. The results indicate that these anthraquinones are responsible for the observed interference and are potent allelopathic substances.
Key wordsPolygonum sachalinense allelopathy allelochemicals anthraquinone emodin emodin-1-O-D-glucoside physcion physcion-1-O-D-glucoside root exudates
Unable to display preview. Download preview PDF.
- Harborne, J.B. 1988. Introduction to Ecological Biochemistry. Academic Press, New York.Google Scholar
- Kang, S.S., andWoo, W.S. 1982. Anthraquinones from the leaves ofPolygonum sachalinense. Kor.J. Pharmacol. 13:7–9.Google Scholar
- Kato, T., andMorita, Y. 1987. Anthraquinone components inRumex acetosa L.Syoyakugaku Zasshi 41:67–74.Google Scholar
- Podojil, M., Sedmera, P., Vokoun, J., Betina, V., Baráthová, H., Duracková, Z., Horáková, K., Nemec, P. 1978.Eurotium (Aspergillus)repens metabolites and their biological activity.Folia Microbiol. 23:438–443.Google Scholar
- Rice, E.L. 1984. Allelopathy, 2nd ed. Academic Press, New York.Google Scholar
- Rovira, A.D. 1969. Plant root exudates.Bot. Rev. 35:35–59.Google Scholar
- Tadano, T., andTanaka, A. 1976. Differences for crop species of ammonium and nitrogen suitability.Nippon Dojo-Hiryogaku Zassi 47:321–328.Google Scholar