Fig. 1.

Sesquiterpene region of the gas chromatograms (HP-1 column, flame ionization detector) of the volatile chemicals collected from flowering A. thaliana (Col-0) wild-type (A) and the transgenic line FS11-4 (B). β-Caryophyllene (peak 1) is the main constituent of the headspace of the wild-type plant, whereas Eβf (peak 2) is the major component of the transgenic plant volatiles, which also contain a greatly reduced amount of β-caryophyllene. (C) Coupled GC–electroantennography using antennae from a female aphid parasitoid, D. rapae. The effluent from the GC column was split and directed simultaneously to the GC detector and the antennal preparation. The upper trace is the GC of air entrainment volatiles from transgenic line FS9-2; the lower trace shows the electroantennograph response (marked by an arrow) to the major peak, Eβf.