Figure 2.

Emission of benzaldehyde (A) and phenylacetaldehyde (B) in petunia flowers during two normal light/dark cycles. Floral scent was collected from 1- and 2-d-old flowers during 48-h period under normal light/dark conditions. An increase of the maximum amplitude in 2-d-old flowers relative to 1-d-old flowers reflects the developmental changes in emission. Gray and white areas correspond to dark and light, respectively. Each graph represents the average of four independent experiments. sds are indicated by vertical bars.