Phytotoxic activity of Chinese violet (Asystasia gangetica (L.) T. Anderson) and two phytotoxic substances

Masahiko Suzuki, M. A. Chozin, Arihiro Iwasaki, Kiyotake Suenaga, Hisashi Kato-Noguchi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Chinese violet (Asystasia gangetica (L.) T. Anderson) is a perennial invasive weed belonging to Acanthaceae. Leaves of this weed have been suggested to possess phytotoxic activity. However, phytotoxic substances in this weed have not yet been reported. Therefore, the present study investigated phytotoxic activity of Chinese violet extracts and phytotoxic substances. The extracts of Chinese violet leaves inhibited the root and shoot growth of cress, lettuce, alfalfa, barnyard grass, ryegrass, and timothy, where the level of inhibition increased with increasing extract concentrations. Bioassay-guided separations of the extracts led to isolation of two phytotoxic substances, indole-3-carboxaldehyde and (6R,9S)-3-oxo-α-ionol. Indole-3-carboxaldehyde significantly inhibited the root and shoot growth of cress at concentrations ≥100 and 30 μmol L −1 , respectively, and concentrations of the substance required for 50% growth inhibition were 210 and 127 μmol L −1 for cress roots and shoots, respectively. The other substance, (6R,9S)-3-oxo-α-ionol, was reported to have strongly inhibited cress roots and shoots. The present results suggest that Chinese violet contains two phytotoxic substances indole-3-carboxaldehyde and (6R,9S)-3-oxo-α-ionol, and those substances may play an important role in the phytotoxic activity of Chinese violet.

Original languageEnglish
Pages (from-to)3-8
Number of pages6
JournalWeed Biology and Management
Issue number1
Publication statusPublished - 2019 Mar


  • invasive weed
  • phytotoxic activity
  • phytotoxic substance
  • plant growth inhibition

ASJC Scopus subject areas

  • Agronomy and Crop Science


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