Trends in differential gene expression. DE genes were determined between each successive day at a threshold cut-off level of 1.5-fold. Each comparative stage, i.e. day, was measured in triplicate and the mean of the hybridization intensities calculated prior to DE analysis. (A) Total number of DE genes and the split between UR and DR genes. (B) The proportion given as percentages of total DE genes comprised by either chloroplast/plastid protein or TF/signaling protein encoding genes as given in the TAIR gene ontology database. Open and closed bars represent UR and DR genes, respectively.