Figure 5.

Gibberellin signals contribute to Suc-induced hypocotyl elongation under short photoperiods. A, The GA biosynthesis inhibitor PAC at 20 μm inhibits Suc-induced hypocotyl elongation. Seedlings were germinated on MS agar and transferred to treatment media after germination; carrier control was 0.12% (v/v) methanol. B, Suc-induced hypocotyl elongation was attenuated in gai-1 mutant seedlings. C, Suc-induced hypocotyl elongation was unaltered in a DELLA global knockout mutant. Experiments performed under 4-h photoperiods. Data are mean ± se (n = 20) from one of two independent repeats, analyzed with ANOVA and posthoc Tukey tests. Different letters indicate statistically significant differences between means (P < 0.05). Osmotic control was 87.6 mm sorbitol.