FIGURE 1.

Shoot illumination is essential for sucrose-promoted primary root growth. (A) Primary root length of 7 days after germination (DAG) Col-0 seedlings grown with (+suc) or without (–suc) 1% sucrose in dark (D), light–dark (LD), or light (L) conditions (n ≥ 19). (B) Primary root length of 10 DAG seedlings grown with (+suc) or without (–suc) for 4 days in LD and shifted to total darkness (LD → D) or kept continuously in LD for additional 6 days (LD); alternatively, seedlings were grown for 4 days in darkness and kept in darkness for additional 6 days (D) or their shoots were briefly exposed to light for 8 h (8-h LD) (n ≥ 10). The letters indicate statistical significance (one-way ANOVA followed by post hoc Tukey’s honestly significant difference (HSD), p ≤ 0.05). Error bars indicate SE.