Fig. 6

Cyclin-B1 expression in the root meristem determined by the GUS signal in a reporter line. An example of a root tip is provided for simulated microgravity, Moon partial gravity (0.17 g RPMHW and RPMSW) and 1 gstatic control conditions. The bars indicate 50 µm. In the graph, the Cyclin B1 signal have been quantified as the optical density through all analyzed root tips. Statistically significant differences (p < 0.05) have been indicated with * vs. 1 g, average n = 6