Phytoalexins from Brassica (Cruciferae) as oviposition stimulants for the cabbage root fly, Delia radicum

  • Baur R
  • Städler E
  • Monde K
 et al. 
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Bacteria species known to induce the biosynthesis of crucifer-specific phytoalexins have ear-lier been shown to be associated with Delia flies. Eleven crucifer-specific phytoalexins and related synthetic com-pounds were applied on surrogate paper leaves and offered to cabbage root flies in oviposition assays. Since three of these compounds (methoxybrassinin, cyclo-brassinin, brassitin) proved to be significantly stimula-tory whereas the remaining metabolites had no effect, the reaction of the fly appears to be structure-specific. Inactive phytoalexins had no inhibitory effect on ovipo-sition. 100 mg of methoxybrassinin per surrogate leaf was as stimulatory as 0.05 gle (gram leaf equivalent) of a methanolic host-leaf (Brassica oleracea) extract. Thus the three active phytoalexins can explain only part of the activity of host-pant extracts but might induce a preference for infected plants.

Author-supplied keywords

  • Bacteria
  • Brassica –
  • Cruciferae –
  • Delia radicum –
  • Diptera –
  • Erwinia caroto6a –
  • Introduction
  • Pseudomonas –

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  • Robert Baur

  • Erich Städler

  • Kenji Monde

  • Mitsuo Takasugi

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