Fig. 5. Origins of the defects in the bop1-1 mutant. (A-F,I,J) Cross sections and (G,H) longitudinal sections of the shoot apex. (A,B) Two-day-old wild-type (A) and mutant (B) seedlings. (C-H) Three-day-old wild-type (C,E,G) and mutant (D,F,H) seedlings. E and F are magnified views of C and D, respectively. Note that ectopic meristematic regions are visible in the bop1-1 mutant (F,H, arrowheads). The black lines in C and D indicate the planes of the sections shown in G and H, respectively. (I,J) Six-day-old wild-type (I) and mutant (J) seedlings. Ectopic outgrowths are distinct on the adaxial side of the cotyledonary petiole (J, arrowheads). c, cotyledons; p, leaf primordia. Bars, 20 µm.