Fig. 3. Scanning electron micrographs of early developmental stages of spw1-1, dl-sup1 and dl-sup2 flowers. (A-C) Wild-type; (D-F) spw1-1; (G-I) dl-sup1; (J-L) dl-sup2. (A,D,G,J) Young flowers at the stage when organ primordia were formed in whorl 3. (B,E,H,K) Young flowers at the stage when stamen primordia have started to form the anther structure in wild type. (C,F,I,L) Flowers at the later stage when the carpel primordia start to form stigmas in wild type. (D,G,J) In spw1-1, dl-sup1 and dl-sup2 flowers, six organ primordia were formed at the positions where stamen primordia were formed in the wild type. (E) In spw1-1, six organ primordia in whorl 3 broaden to form carpels. (F) Emergence of ectopic palea-like organ primordia in spw1-1. (H,K) dl-sup1 and dl-sup2 flowers. The primordium of the first ectopic stamen (arrowhead) is developing from the lemma side of whorl 4. (I,L) At the later stage, the floral apical meristem (arrowhead) has continued to produce many ectopic stamens. le, lemma; pa, palea; ep, ectopic palea-like organ; es, ectopic stamen. Bars: 30 µm.

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