Fig. 4.

Electron micrographs of Zygnema sp. B control cells (a and b) and cells treated for 3 h with 800 mM sorbitol (c and d). (a) Overview of a pre-akinete cell with chloroplasts, vacuoles and lipid droplets, electron dense particles are marked with arrows, (b) detail in the cell centre with nucleus, mitochondria and chloroplast, (c) condensed cytoplasm in the cell centre with altered mitochondria, (d) detail view on golgi bodies in condensed cytoplasm. Abbreviations: Chl, chloroplast; CW, cell wall; G, golgi body; L, lipid droplets; M, mitochondrion; N, nucleus; V, vacuole. Bars a 10 μm; b–d 1 μm.