Figures 9–14 in Cell structure and microtubule organisation during gametogenesis of Ulva mutabilis Føyn (Chlorophyta)

Figures 9–14: Immunolocalization of tubulin in developing gametangia of Ulva mUtabilis. (9) Interphase cell before induction of gametogenesis. The microtubules are mainly peripherally arranged in more or less parallel bundles. Scale bar: 20 µm. (10) Early stage, 36–48 h after induction of gametogenesis. Intensely fluorescent microtubule bundles traverse the cortical cytoplasm converging on a particular area (arrow localises the conical cell projection). Scale bar: 20 µm. (11) More advanced stage, 48–60 h after induction of gametogenesis, showing microtubules starting from a pointed site at basal part of gametangium. Scale bar: 20 µm. (12) Αdvanced stage, 48–60 h after induction of gametogenesis, showing microtubules organised in a basketlike configuration, leaving a circular opening at the top (arrow). Scale bar: 20 µm. (13) Gametangium, 60–72 h after induction of gametogenesis. The microtubule-free area at the top appears broader than before (arrow). Scale bar: 20 µm. (14) Hoechst 33258 staining of the nucleus of the cell in Figure 12. Scale bar: 20 µm.