Influence of phyA, phyB1B2, and cry1 (A) and dgt (B) as scions in grafted plants, and RBOH1 suppression in the leaves of the rootstock (C), on the effects of irradiance to the apex on ATP accumulation in the fourth leaves. D, Dark control; L, WL (300 μmol m−2 s−1) applied to the apex (top lighting) for 30 min. Samples were harvested after the fourth leaves were exposed to WL for 8 min with preillumination or not. During the illumination treatments, the other parts of the plant were kept in darkness. Values are means of four plants ± sd. Different letters indicate significant differences at P < 0.05 according to Tukey’s test. FW, Fresh weight.