A potent allelopathic substance in cucumber plants and allelopathy of cucumber

Hisashi Kato-Noguchi, Ho Le Thi, Hiroaki Sasaki, Kiyotake Suenaga

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


A potent growth inhibitory substance was isolated from an aqueous methanol extract of cucumber (Cucumis sativus L. cv. Phung Tuong) plants and determined as (2S)-2,3-dihydro-2α-(4-hydroxy-3-methoxyphenyl)-7-methoxy-5-(1,2,3-trihydroxypropyl)benzofuran-3β-methanol (sisymbrifolin) by spectral data. Sisymbrifolin inhibited the growth of cress (Lepidium sativum) and Echinochloa crus-galli seedlings at concentrations greater than 3 μM. Concentration of sisymbrifolin in the cucumber plants was the greatest among four growth inhibitory substances, (S)-2-benzoyloxy-3-phenyl-1-propanol, 9-hydroxy-4,7-megastigmadien-9-one, (6S,7E,9S)-6,9,10-trihydroxy-4,7-megastigmadien-3-one, and sisymbrifolin found in the cucumber, whereas growth inhibitory activity of 9-hydroxy-4,7-megastigmadien-9-one against cress and E. crus-galli was the greatest. Total activities of these substances (concentration of the substance/concentration required 50 % growth inhibition) were 14. 4, 13. 2, 8. 5 and 10. 7 for (S)-2-benzoyloxy-3-phenyl-1-propanol, 9-hydroxy-4,7-megastigmadien-9-one, (6S,7E,9S)-6,9,10-trihydroxy-4,7-megastigmadien-3-one and sisymbrifolin, respectively. These total activities were about 100-fold greater than those of phenolic acids, which are often mentioned as putative allelochemicals of plants. Thus, these substances may play important roles in the allelopathy of cucumber plants through the growth inhibition of neighboring plant species.

Original languageEnglish
Pages (from-to)2045-2049
Number of pages5
JournalActa Physiologiae Plantarum
Issue number5
Publication statusPublished - 2012 Sept 1


  • Allelopathy
  • Cucumber
  • Cucumis sativus
  • Echinochloa crus-galli
  • Growth inhibition

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science


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