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Journal of Chemical Ecology

, Volume 18, Issue 8, pp 1287–1297 | Cite as

Inhibition of growth ofPhytophthora parasitica var.nicotianae by aromatic acids and coumarins in a laboratory bioassay

  • Maurice E. Snook
  • Alexander S. Csinos
  • Orestes T. Chortyk
Article

Abstract

Hydroxy-, dihydroxy-, trihydroxy-, methoxy-, dimethoxy-, hydroxy-+methoxy-, amino-, chloro-, and nitro-substituted benzoic, phenylacetic, phenylpropanoic, and phenylpropenoic (cinnamic) acids were evaluated for activity against the growth ofPhytophthora parasitica var.Nicotianae, Races 0 and 1, in a laboratory bioassay. Several substituted coumarins were also tested. In general, for Race 0, the phenylpropenoic acids were more active (on a millimolar basis), than the corresponding benzoic, phenylacetic, or phenylpropionic acids (9 of 14 series). Among the most active acids wereo-hydroxycinnamic and the chloro- and methoxycinnamic acids. The activities of unsubstituted benzoic and phenylpropionic acids were comparable to the most active compounds tested. Monohydroxyaromatic acids were more active than most dihydroxy acids of the same chain length. Dihydro-3,4-dihydroxycinnamic acid was slightly more active than the corresponding cinnamic acid, while the reverse was true for the mono-p-hydroxycinnamic acid versusp-hydroxyphenylpropionic acid. Coumarin was more active than its hydroxy, methyl, hydroxymethyl, or methoxy derivatives. In general, Race 1 was even more significantly affected by the aromatic acids. Glycosylated coumarins were inactive in the bioassay, compared to their aglycones.

Key Words

Phytophthora parasitica var.Nicotianae black shank aromatic acids bioassay growth inhibition 

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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • Maurice E. Snook
    • 1
  • Alexander S. Csinos
    • 2
  • Orestes T. Chortyk
    • 1
  1. 1.Phytochemical Research Unit USDA-ARSRussell Research CenterAthens
  2. 2.Department of Plant PathologyUniversity of GeorgiaTifton

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