Fig. 3. Histological analysis of bop1-1 mutant plants. (A,C,E) Wild-type leaf petioles. (B,D,F) bop1-1 mutant leaf petioles. The adaxial surface is at the top. (A,B) Petioles of cotyledon. (C,D) Petioles of rosette leaf. E and F are magnified views of C and D, respectively. Note that ectopic outgrowths develop on the vasculature (B,D, arrowheads). Secondary outgrowths are formed on the primary ectopic outgrowths (D, arrows). (G,H) Extended petioles. The adaxial surface is at the top. (G) Extended cotyledonary petiole. (H) Extended petiole of first rosette leaf. P, phloem cells; X, xylem cells. Bars, 100 µm in (A-D,G,H), and 20 µm in (E,F).

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