Figure 7.

Specificity of various fatty acids and some methyl esters for elicitation of H₂O₂ and for enhancement of H₂O₂ elicitation by a fungal elicitor. Fatty acids were used at 47 μg mL⁻¹. Elicitor activity and enhancement are given relative to the activity of the fungal elicitor (see Fig. 1). Note that enhancement values <1 indicate inhibition. The time course was different for the various compounds. The elicitor activity is given, therefore, as the highest H₂O₂ concentration reached at the time indicated. Means ± sd from three independent experiments are shown. c-LA, cis,cis-Linoleic acid; t-LA, trans,trans-linoleic acid; 9-ELA and 12-ELA, cis,cis-9-ELA and cis,cis-12-ELA, respectively; 9-ELAM and 12-ELAM, cis,cis-9-ELAM and cis,cis-12-ELAM, respectively.