Figure 6.

O₃-regulation of CRKs is different in hormone mutants. The expression of 24 O₃-regulated CRKs was analyzed by qPCR in Col-0 and sid2, npr1, dnd1, ein2 and fad3/7/8 exposed to 250 ppb O₃ for 6 h. Samples were harvested at 1 or 8 h (6 h plus 2 h recovery under clean air conditions) after the onset of the O₃ treatment. Transcript levels for Col-0 or each mutant line were calculated by comparison of O₃-exposed plants with corresponding control plants of the same line grown under clean air conditions. An expression level of one indicates no change of expression, increased expression is indicated by values larger than one while decreased expression is shown by values smaller than one. Increase of expression by 2-fold or higher is high-lighted in red and decrease in expression by 2-fold or more in green. NR - no reproducible data could be obtained for this gene. The experiment was repeated four times; fold change was calculated from the average normalized cycle difference of all biological repeats. Statistically significance (Benjamini-Hochberg FDR corrected p-value ≤ 0.1) is indicated with asterisks (see additional file 1).