Figure 1. The experimental set-up is shown in the top part.

Receiver plants [either wt (plants with green leaves) or hpl1 (plants with pale green leaves)] were exposed to volatiles from emitter plants located at the center of the box. The emitter plants (plants with yellow leaves) were either artificially damaged with scissors or undamaged. The emitter plants were damaged twice a week for three weeks. After 3 weeks exposure, the receiver plants were subjected to choice bioassays with C. glomerata females. The middle part shows the notation of receiver plants exposed to damaged emitter plant voaltiles. Notation is shown as emitter-[receiver]. For the bioassay, the exposed plants were either artificially damaged with scissors or undamaged. The bottom part shows the notation of receiver plants exposed to undamaged emitter plant voaltiles.