Fig. 4. In situ localization of SOC1 in wild-type and ap1-1 Arabidopsis plants. (A-D) Serial longitudinal sections of a wild-type inflorescence apex hybridized with SOC1 antisense probe. An arrow in D indicates another floral meristem appearing at the edge of the inflorescence meristem. (E,F) Longitudinal sections of wild-type floral meristems at stage 4 (E) and stage 7 (F) hybridized with SOC1 antisense probe. (G) A longitudinal section of an ap1-1 inflorescence apex hybridized with SOC1 sense probe. (H) A longitudinal section of an ap1-1 stage-7 floral meristem hybridized with SOC1 sense probe. (I-N) Serial longitudinal sections of an ap1-1 inflorescence apex hybridized with SOC1 antisense probe. Note the ectopic expression of SOC1 in floral meristems at stage 1 to early stage 3. (O,P) Longitudinal sections of ap1-1 floral meristems at stage 3 (O) and stage 7 (P) hybridized with SOC1 antisense probe. Note the SOC1 expression throughout the stage 3 and stage 7 floral meristems. Numbers in A-P indicate floral stages (Smyth et al., 1990). Scale bars: 100 µm for all panels.