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Fig. 1. Steroid-inducible stamen and carpel development. (A,B) ag-3, AGGR
inflorescences, mock treated (A) or treated with dexamethasone (DEX; B). (C,D)
Close-up view of flowers from the plants shown in A,B; while the mock-treated
plant shows an indeterminate number of sepals and petals (C), DEX treatment
has induced stamen (st) and carpel (ca) development (D). (E,F) cal-1,
ap1-1, AGGR inflorescences, two weeks after mock treatment (E) or
treatment with DEX (F). Note the mass of meristems in E (similar to those
shown at high magnification in G) compared with the mature stamens and carpels
in F. (G-I) Scanning electron micrographs of cal-1, ap1-1, AGGR
inflorescences 1 day (G), 3 days (H) and 7 days (I) after DEX treatment. The
arrows in H indicate meristems that are beginning to produce organ primordia;
in I, developing stamens (st) and carpels (ca) are morphologically
identifiable. Scale bars: 5 mm in A,B; 1 mm in C-F; 100 µm in G-I.
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