Figure 3.

Effects of auxin on transcript abundance and plant growth. A, Transcript abundance; whole shoot samples were harvested 1, 8, and 24 h after spraying, which was performed halfway through the light period. Semiquantitative RT-PCR was performed on 3-week-old tobacco plants sprayed with 0.5 μm NAA and then exposed to an extended photoperiod (24 h at 250 μmol m^–2 s^–1). B, Plant growth; phenotype of NAA-treated and -untreated plants showing seedlings before treatment (a) and 1 week after the treatment (b). This experiment was repeated three times and similar results were obtained.