Figure 4

Floral landmarks representing female reproductive development. (A) Landmark 7 occurs nine days after floral initiation. (B) Ten days after floral initiation, the developing ovules become visible. (C) Eleven days after floral initiation, the megaspore mother cell forms, marking female meiosis and floral landmark 9. (D) Landmark 9 megaspore mother cell showing the nuclei (orange color) and the tubulin (green color). (E) Twelve days after floral initiation, the single integument has nearly covered the developing embryo sac. (F) The developing ovule with a clear micropyle is visible 14 days after floral initiation. Scale bar, 50 μm (A, B, F), 10 μm (C, D), 20 μm (E).