Fig. 3. In situ localization of SVP in wild-type and ap1-1 Arabidopsis plants. (A) A longitudinal section of a wild-type inflorescence apex hybridized with AP1 antisense probe. (B,C) Two successive longitudinal sections of a wild-type inflorescence apex hybridized with SVP antisense probe. (D,E) Longitudinal sections of wild-type floral meristems at stage 3 (D) and stage 7 (E) hybridized with SVP antisense probe. (F) A longitudinal section of an ap1-1 inflorescence apex hybridized with SVP sense probe. (G-I) Serial longitudinal sections of an ap1-1 inflorescence apex hybridized with SVP antisense probe. An arrow in I indicates another floral meristem appearing at the edge of the inflorescence meristem. (J) Longitudinal section through ap1-1 floral meristems at stage 3 or later stages hybridized with SVP antisense probe. Arrows indicate the ectopic expression of SVP. (K,L) Two successive longitudinal sections of an ap1-1 stage-4 floral meristem hybridized with SVP antisense probe. Note the ectopic expression of SVP in the adaxial surface of the first whorl organs. Numbers in A-L indicate floral stages (Smyth et al., 1990). Scale bars: 100 µm for all panels.