Figure 7.

Gynoecium development: stages 13–15. (A) SEM of a stage 13 gynoecium showing the pollination of the stigma (stg). The style (sty), valves (va), replum (rep), and gynophore (gyn) are all clearly distinguishable by this stage. (B) Transverse section of a stage 13 gynoecium showing all the parts of the mature gynoecium: replum (rp), medial vascular bundle (mv), septum (sp), exocarp (ex), mesocarp (ms), transmitting tract (tt), ovule (o), lateral vascular bundle (lv), and locule (lc). (C) Longitudinal section through a stage 13 valve showing differentiation of the exocarp (X), enb (T), and ena (E). (D) SEM of stage 13 ovules, which finish development and become ready for fertilization. (E) SEM of a stage 14 flower where the medial stamens extend above the top of the stigma (reproduced with permission from Nature Publishing Group (http://www.nature.com/). (F) Cross-section of a stage 14 gynoecium. The replum (r), valve (v), valve margins (arrowheads vm), mesocarp (me), endocarpa (ena), and endocarpb (enb) are labeled. (G) SEM of a stage 14 ovule. (H) Paths of the pollen tubes growing through the stigma and transmitting tract to fertilize the ovules viewed with aniline blue fluorescence in a cleared stage 14 gynoecium. (I) Picture of a stage 15 fruit, which has extended above the top of the anthers. The floral organs in front of the fruit have been removed. (J) Cross section of a stage 15 gynoecium. Scale bars in A and C represent 100 µm, in B, F, and J represent 50 µm, and in E and I represent 500 µm. A and H: from Alvarez et al., 2002. B: from Ferrándiz et al., 1999. C: from Vivian-Smith and Koltunow, 1999. D and G: from Meister et al., 2002. E: from Liljegren et al., 2000.Note:Section E is reproduced with permission from Nature Publishing Group (http://www.nature.com/).