Figure 4.

Hypocotyl length of dark-grown mutants and transgenic plants overexpressing SPY. Final hypocotyl length of seedlings grown in the dark on filter paper saturated with 1× Murashige and Skoog salts and 1% (w/v) Suc. In a, the “−GA” treatment consisted of imbibing the seeds for 3 d in 3 × 10⁻⁵ M GA₃, rinsing, and transferring to a solution without GA. The “+GA” seedlings were allowed to germinate and grow in the presence of 3 × 10⁻⁴ M GA₃. In b, no exogenous GA was added. Data from three independent 35S:SPY lines are shown. Line #4 is also homozygous for the spy-3 mutation.