a. Photo of transgenic Nicotiana tabacum plant sprayed with 5 mM methyl jasmonate solution or buffer (control) before and after treatment. Two plants depicted are representative of six plants analyzed in three independent imaging experiments. b. Photo of transgenic Nicotiana tabacum plant incubated in a closed vial with ripe banana skin. Two plants depicted are representative of four plants analyzed in two independent imaging experiments. c. Circadian oscillations of luminescence. Photos of three plants were being captured constantly for ten days, in normal light conditions (17.5 h day; days 1-3 and 8-10) or in constant darkness (days 4-7). Each image of Plant 1 was compressed into a single vertical line of pixels to create the kymogram. The mean brightness of plants 1-3 is displayed on the graph. The graph on days 1-3 is representative of nine plants in three independent experiments. The full graph (days 1-10) shows the luminescence of three plants in a single experiment. Pseudocolor is used for visual clarity.