Figure 1

Phenotypic analysis of ap3 ucn , ag ucn and ap2 ucn flowers. Light micrographs of stage 14 flowers. Arrows indicate protrusions, arrowheads indicate absence of protrusions. (A) Wild-type (Ler). (B) ucn-1. Note the presence of protrusions on petals and stamens but their absence on sepals. (C) ap3-3. One first-whorl sepal was removed to reveal the inner second-whorl sepal. The star indicates a first-whorl sepal. (D) ap3-3 ucn-1 double mutant. Similar setup as in (C). Note the absence of protrusions on the second-whorl sepal. Serrations at the tip of the second-whorl sepal regularly occur in ap3-3 single mutants. (E) ag-1 flower. Star indicates a fourth-whorl sepal. (F) ag-1 ucn-1 double mutant. Protrusions are found on second- and third-whorl petals. (G) ap2-8. First-whorl unfused carpels with ovules are visible. (H) ap2-8 ucn-1. The first-whorl ovules carry protrusions. Scale bars: 0.5 mm.