FIG. 4.

Viability of the photobiont of B. frigida after exposure to EVT-1 conditions of low and high temperatures as percentage of metabolically active cells by live/dead staining with FUN-1. The exposure was performed under simulated space conditions on rock and simulated Mars conditions on P- and S-MRS. The experimental conditions are “control” (CO), exposure for 1 h at −25°C (−25), and exposure for 1 h at +60°C (+60). Percentage given as mean value±standard deviation of n=5–15 thallus sections and 336–898 cells counted.