Fig. 1. Phenotypes of seu mutant plants. A-C,I are photographs; D-H and J-K are scanning electron micrographs. (A) A wild-type flower. (B) A seu-1 mutant flower with narrow petals (arrow) and narrow sepals (arrowhead). (C) A seu-2 mutant flower exhibiting a whorl 1 stamen/carpel mosaic organ (arrowhead) and a whorl 2 petal that is reduced in size and is staminoid (arrow). The tip of the gynoecium is unfused, exposing the ovules (o). (D) Abaxial surface of a seu-1 whorl 1 organ. Both petal (pe) and sepal (se) cells are present. (E) An enlargement from the boxed area in D. Both round-shaped petal cells (arrow) and rectangular-shaped sepal cells (arrowhead) are present. (F) Wild-type petal cells. (G) Wild-type sepal cells. (H) A seu-2 mutant flower. Note the long tubular organs (arrows) in whorl 2. These tubular organs are likely petal in identity because of the petal blade at the tip of the tube. (I) Wild-type and mutant plants. All plants are Ler ecotype. The ruler is 15 cm long. The seu-1 plant is about half the height of the wild-type one; seu-1 ap2-1 is similar in height to seu-1; seu-1 lug-8 double mutant is less than half the height of seu-1 and is bushy. Inset box is an enlarged picture of a seu-1 lug-8 plant. (J) A mature wild-type ovule. (K) A seu-1 ovule with an abnormal protrusion at the micropylar end (arrowhead). Scale bars in D, E, G, J, K are 100 µm; bar in F is 50 µm; bar in H is 1 mm.
