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Journal of Plant Growth Regulation

, Volume 18, Issue 2, pp 65–67 | Cite as

Allelopathic Substance Exuded from a Serious Weed, Germinating Barnyard Grass (Echinochloa crus-galli L.), Roots

  • T.  Yamamoto
  • K.  Yokotani-Tomita
  • S.  Kosemura
  • S.  Yamamura
  • K.  Yamada
  • K.  Hasegawa

Abstract.

The allelopathy of a serious weed, barnyard grass (Echinochloa crus-galli L.), was investigated. Root exudates of young barnyard grass showed allelopathic effects and plant-selective activity and inhibited root elongation of all plants tested. With respect to shoot growth, the exudates did not show inhibition of barnyard grass only. The allelopathic substance was isolated and identified as p-hydroxymandelic acid by NMR. p-Hydroxymandelic acid strongly inhibited shoot growth and root elongation of all plants tested. The effects of three congeners of p-hydroxymandelic acid were tested on rice shoot growth. In the biological activity exhibited in rice, shoot growth was related to the hydroxyl groups.

Key Words. Allelopathic substance—Allelopathy—Barnyard grass (Echinochloa crus-galli L.)—Root exudate—Plant growth regulator—p-Hydroxymandelic acid 

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Copyright information

© Springer-Verlag New York Inc. 1999

Authors and Affiliations

  • T.  Yamamoto
    • 1
  • K.  Yokotani-Tomita
    • 2
  • S.  Kosemura
    • 3
  • S.  Yamamura
    • 3
  • K.  Yamada
    • 2
  • K.  Hasegawa
    • 2
  1. 1.Master's Program in Biosystem Studies, University of Tsukuba, Tsukuba, Ibaraki 305-8572, JapanJP
  2. 2.Institute of Applied Biochemistry, University of Tsukuba, Tsukuba, Ibaraki 305-8572, JapanJP
  3. 3.Department of Chemistry, Faculty of Science and Technology, Keio University, Hiyoshi, Yokohama, Kanagawa 223-0061, JapanJP

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