Fig. 6

Relative expression of genes involved in DNA damage repair in A. thaliana and P. cheesemanii. Two genes involved in photorepair (PHR1 and UVR3) and four genes involved in nucleotide excision repair were selected. Six-week-old A. thaliana and nine-week-old P. cheesemanii plants were treated with white light (Control) or white light supplemented with UV-B radiation for 5 h (UV-B-5 h). Mature leaves were harvested for RT-qPCR analysis. The expression of transcripts indicated in each of the graphs was normalized to the reference genes of A. thaliana and P. cheesemanii, respectively. Relative expression (fold change) was calculated by dividing expression values of UV-B-treated plants with thoes of control-treated plants. Data were from three independent biological replicates. 1, A. thaliana Col-0; 2, A. thaliana Kondara; 3, P. cheesemanii Kingston; 4, P. cheesemanii Wye creek. Error bars represent SEM. Means with different lowercase letters indicate values of UV-B treated samples that are significantly different between the accessions analyzed (Tukey’s HSD, p < 0.05)