Fig. 1. Phenotype of the esd4 mutant. (A) A wild-type plant (left) and an esd4 mutant (right) grown under long days. Both plants are 5 weeks old. (B) A wild-type plant (left) and an esd4 mutant (right) grown under short days. Both are 6 weeks old. (C) An esd4 mutant grown under long days. The arrows indicate siliques that have developed in unexpected positions. (D) The section of the stem of esd4 mutants shown in C at higher magnification. (E) A comparison of silique shape in wild-type (left) and esd4 (right) plants. (F-H) The apex of 4-week-old plants: (F) wild-type; (G) esd4 mutant; (H) esd4 mutant showing the pistil-like structure (arrow) that terminates the shoot. (I,J) Scanning electron micrographs of the apex of the shoot 4-week-old wild-type (I) and esd4 mutant (J) plants grown under long days. The scale bars are 300 µm. (K) Schematic diagram illustrating the structure of wild-type and esd4 plants. The arrows represent indeterminate shoots, the circles flowers, and rosette and cauline leaves are shown as ovals. (L) The frequency with which various abnormalities were recorded at the node containing the last cauline leaf or the first flower. CL, cauline leaf; S, solitary flower; I, inflorescence. Percentages illustrate the proportion of plants that showed each abnormality. Fewer than 1% of wild-type plants showed any of these abnormalities.