Fig. 2. seu-1 enhances the floral defects of lug and ap2. A-B,E-F,J are photographs; C-D,G-I,K-L are SEMs. (A) A lug-1 mutant flower with narrow petals (arrow) and split gynoecium (arrowhead). (B) A seu-1 lug-1 double mutant flower at twice the magnification of the flower in A. The seu-1 lug-1 flower is roughly 25% size of a wild-type flower. Only two carpelloid organs with horns (h) are formed in whorl 1. A single stamen forms in whorl 3. Whorl 4 is reduced to a small mound of tissue (arrowhead). (C) A seu-1 lug-2 flower. Whorl 1 organs are carpelloid (arrow) but lack stigmatic tissue and ovules. Whorl 4 is just a small mound of tissue (arrowhead). (D) A seu-1 lug-8 mutant flower. The small mound of tissue in whorl 4 (arrowhead) forms two ovule primordia (op). Inset box is an enlargement of the ovule primordia. (E) An ap2-1 mutant flower. Whorl 1 organs are leaf-like with trichomes characteristic of leaves (arrow). (F) A seu-1 ap2-1 double mutant flower. Whorl 1 organs are carpelloid with stigmatic tissues (arrowhead) and ovule primordia (op). (G) An ap2-2 flower. The relatively normal whorl 4 gynoecium is indicated (arrow). Whorl 1 organs are carpelloid with stigmatic tissus (arrowhead) and ovule primordia (op). (H) A seu-1 ap2-2 double mutant flower. Whorl 1 organs are carpelloid with ovule primordia (op) along their margin but lack stigmatic tissues. A stamen/sepal mosaic organ was removed (arrow) to reveal whorl 4 that is reduced to a mound of tissue (arrowhead). (I) A seu-1 flower. Two whorl 1 sepals have been removed to reveal a narrow petal (arrow) and an unfused gynoecium (arrowhead). (J) A seu-1/seu-1; ap2-2/+ mutant flower. The presence of ap2-2/+ enhances seu-1/seu-1 as shown by a stamenoid/carpelloid organ (arrowhead) in whorl 1 and a stamenoid petal (arrow) in whorl 2. (K) A seu-1/seu-1; lug-1 + /+ ap2-1 flower. The presence of lug-1 + /+ ap2-1 further enhances seu-1/seu-1. A whorl 1 organ with both stamen and carpel characteristics is indicated (arrowhead). (L) A seu-1/seu-1; lug-1 +/ + ap2-1 flower. Note the carpelloid whorl 1 organ with ovule primordia (op) on the organ margin and a horn (h) on the top. Scale bars in C, D, I, K, and L, 1 mm; in G and H, 100 µm.
