Fig. 1.

Expression pattern of KLU in developing ovules. (A–D) Fluorescence of a vYFPer reporter protein expressed under the control of the KLU promoter during progressively later stages of ovule development. Reporter expression is detected at the base of the nucellus and in the inner integument (solid arrow), but is absent from the outer integument (open arrow). Asterisk indicates the megaspore mother cell (A and B) and developing embryo sac (C) within the nucellus. (A) Stage 2-II ovule. (B) Stage 2-III ovule. (C) Stage 2-V ovule. (D) Stage 3-VI ovule. Stages are in accordance with those described by Schneitz et al. (32). (Scale bars: 20 μm.)