Figure 6.
Selected ion mass spectra of methyl cinnimate (A), methyl benzoate (B), and methyl salicylate (C) showing isotopic enrichment from [13C1]Phe. Tobacco plants were inoculated with TMV, held at 32°C for 96 h, shifted to 23°C for 6 h, and infiltrated with 1 mm [13C1]Phe. The phenolics were then analyzed by GC-MS 6 h after infiltration. Major ions are shown and enrichment was determined by a shift in the mass to M+ 1. Methylated structures are shown and the location of enrichment is indicated with an asterisk.