Growth retardation of gig under normal conditions. A, Twelve-day-old seedlings of Col-0 (left) and gig (right) grown on MS agar plates with 1% Glc. Bar= 1 cm. B, Root growth assay of Col-0 and gig seedlings from 3 to 12 d after germination (DAG). C, Differential interference contrast image of root meristem size of Col-0 and gig at 8 DAG. Black arrowheads indicate the QC, whereas blue arrowheads demarcate the upper margin of the MZ. D and E, Measurement of meristem cortex cell number (D) and meristem length (E) from 2 to 10 DAG. F, CYCB1::GUS expression in Col-0 and gig roots at 7 DAG. Bar= 50 μm. G, Length of the CYCB1::GUS expression zone. Error bars indicate se; * P < 0.05.