Camalexin accumulation in Arabis lyrata

Inoculation of leaves of Arabis lyrata with either a bacterial pathogen Pse udomonas syringae pv. maculicola strain ES4326 or Cochliobolus carbonum, a fungal nonpathogen of A. lyrata, resulted in the accumulation of a compound with similar chromatographic and fluorescent properties to that of camalex in (I), a phytoalexin produced by Arabidopsis thaliana. A. lyrata is closel y related to A, thaliana. High resolution electron impact mass spectroscopi c and proton NMR analysis confirmed that the compound produced by A. lyrata is camalexin. (C) 1998 Elsevier Science Ltd. All rights reserved.