Fig. 3. In situ expression pattern of INCO in longitudinal sections of wild-type (A-E) and mutant (F,G) plants. (A,C) INCO accumulates in vegetative P0 and P1 primordia and in axillary meristems (AM) in wild-type seedlings. (B) INCO messenger in initiating bracts (P0) and in young floral meristems (FM) of a wild-type inflorescence. Signal is absent from the apical dome of vegetative (SAM) and inflorescence (IM) meristems. (D) Stage 2 floral meristem with emerging sepal primordia (sep). (E) Floral meristem at late stage 3. (F) INCO expression is not affected by the flo-662 mutation. (G) Reduced INCO expression in squa mutant inflorescences. Serial sections probed with FLO revealed signals as in wild type, proving that decreased INCO expression is not an artefact (not shown). IM^* is an axillary inflorescence meristem. (H,I) In inco inflorescences, expression of the floral meristem identity controlling genes FLO and SQUA is comparable with wild type (not shown). Scale bars: 200 µm in A,B,F-I; 100 µm in C-E.