Fig. 2. Ectopic organ outgrowths on bop1-1 mutant plants. (A,C,E,I) Wild type. (B,D,F-H,J) bop1-1 mutant. (A,B) Ten-day-old seedlings. One leaf has been detached. Ectopic outgrowths are seen on the petioles of mutant cotyledons (B, arrowheads). (C,D) Detached first leaves of 10-day-old wild-type (C) and bop1-1 (D) seedlings. Adaxial side views. Arrows in D indicate ectopic outgrowths at the base of the petiole of a mutant rosette leaf. (E,F) Detached first leaves of 15-day-old wild-type (E) and mutant (F) seedlings. Abaxial side views. Note the ectopic outgrowths on the petiole of the mutant (F, arrowheads). (G,H) Detached third leaves of a 23-day-old mutant plant. Note the development of numerous trichomes and leaf primordia on the proximal region of the mutant leaf (H). (I,J) Cauline leaves of a mature wild-type (I) and mutant (J) plant. The arrowheads in J represent ectopic outgrowths on mutant plants. Bars, 100 µm (A-D,H), and 300 µm in the remaining panels.