Figure 4.
Effects of UV radiation on the relative variable fluorescence of L. gibba mutants. Fronds were raised phototrophically on Hutner's medium and exposed for 24 h to 4.4-W m−2 UV. Before (▪) and after (□) UV treatment, the minimal fluorescence (Fo) and the maximal fluorescence (Fm) were measured on dark-adapted samples. Fronds of mutant R1 (A) and the corresponding PL fronds (B) of mutant mTR and the corresponding PL 3F7-11. Values represent averages of eight measurements. ses of the mean are given. Statistical analysis (Student's t test) shows a significant difference between mTR and 3F7-11 (P < 0.01) following UV treatment.