Fig. 2.

Flowering is blocked by a GA biosynthesis inhibitor, paclobutrazol (PAC), if it is applied prior to an LD exposure. PAC was applied once as a soil drench at various times before or after the plants were exposed to: (A) a single FR-rich LD from incandescent lamps (LD-FR); or (B) two LD at high intensity from fluorescent lamps (LD-R). The shaded bar shows the LD exposure. The horizontal lines indicate flowering times of untreated plants exposed to one or two LD. The SD plants were vegetative when the experiment was terminated. The means and SE were based on 14 replicates in (A) and 16 in (B).