Journal of Chemical Ecology

, Volume 20, Issue 2, pp 309-314

First online:

Allelopathy of oats. I. Assessment of allelopathic potential of extract of oat shoots and identification of an allelochemical

  • Hisashi Kato-NoguchiAffiliated withDepartment of Bioresource Science, Faculty of Agriculture, Kagawa University
  • , Seiji KosemuraAffiliated withDepartment of Chemistry, Faculty of Science and Technology, Keio University
  • , Shosuke YamamuraAffiliated withDepartment of Chemistry, Faculty of Science and Technology, Keio University
  • , Junya MizutaniAffiliated withMizutani Plant Ecochemicals Project, Eniwa RBP Center Building
  • , Koji HasegawaAffiliated withInstitute of Applied Biochemistry, University of Tsukuba

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The allelopathic potential of oat (Avena sativa L.) extracts was investigated under laboratory conditions. The ethyl ether-, acetone-, and water-soluble fractions obtained from the extract of oat shoots inhibited the germination and growth of roots and hypocotyls of lettuce (Lactuca sativa L.). The inhibitory activity of the water-soluble fraction was maximum, followed by that of ethyl ether-soluble and acetone-soluble fraction. An active principle of the water-soluble fraction was isolated and its structure was determined by spectral data asl-tryptophan.l-Tryptophan inhibited the growth of hypocotyls and roots of lettuce seedlings at concentrations greater than 0.03 and 0.1 mM, respectively. These results suggested thatl-tryptophan may be an allelochemical which affects the growth or germination of different plant species.

Key Words

Allelochemical phytotoxicity Avena sativa lettuce Lactuca sativa oat l-tryptophan