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Journal of Chemical Ecology

, Volume 18, Issue 10, pp 1833–1840 | Cite as

Allelochemicals fromPolygonum sachalinense Fr. Schm. (Polygonaceae)

  • M. Inoue
  • H. Nishimura
  • H. H. Li
  • J. Mizutani
Article

Abstract

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 words

Polygonum sachalinense allelopathy allelochemicals anthraquinone emodin emodin-1-O-D-glucoside physcion physcion-1-O-D-glucoside root exudates 

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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • M. Inoue
    • 1
  • H. Nishimura
    • 2
  • H. H. Li
    • 1
  • J. Mizutani
    • 1
  1. 1.Mizutani Plant Ecochemicals ProjectResearch Development Corporation of Japan (JRDC)EniwaJapan
  2. 2.Department of Bioscience and TechnologyHokkaido Tokai UniversitySapporoJapan

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