Effect of sodium tungstate on P. patens protonema growth.

A) Plants grew for seven days on simple Knop medium or on media supplemented with the indicated concentrations of sodium tungstate. Pictures were taken at the beginning and end of the experiment, Day 0 and Day 7, respectively. Scale bar = 3 mm B) Plant relative growth rate was measured according to 52. (ln a_f—ln a₀)t^-1 where a_f and a₀ are the plant area at day 7 and at day 0, respectively. t is the time growth in days = 7. Data are mean of three independent experiments. Data were analyzed by one-way ANOVA and Tukey´s multiple comparison test (n = 84). Different letters indicate a statistically significant difference (P < 0.05). Error bars denote SE.