Fig. 6. Shoot transcriptional qRT-PCR profile of selected genes related to sulphur metabolism, using Col-0, cad2-1 ,pad2-1 , rax1-1 and cad1-3 Arabidopsis treated with 0 or 3 µM Hg for 72 h. Values are presented as log2-fold change of Hg-treated plants relative to control plants of each genotype. Statistical differences with Col-0 (at p < 0.05) are represented as red and green boxes for over- and down-regulated genes, respectively. Grey boxes indicate no statistical differences. Data of genes encoding transcription factors () are shown in the inset box (). Light blue boxes also highlight genes differentially expressed. See quantitative values and statistics in Supplementary Table 3.