Fig. 1.

TEM and LTSEM micrographs of Trebouxia sp. TR9 exposed to cyclic D/R. For TEM, TR9 cells were exposed to no D/R cycles (control, A) or four D/R cycles (desiccation, B; rehydration, C). For LTSEM, TR9 cells were exposed to no D/R cycles (control, D) or a single D/R cycle (desiccation, E; rehydration, F). Thick arrows indicate the CW and thin arrows mark plasmalemma invaginations. The asterisk in (B) indicates a gap between the Epon 812 resin and the CW, probably due to reduced adherence of the collapsed regions to the resin. Abbreviations in (A): ch, chloroplast; m, mitochondrion; py, pyrenoid; s, starch.