Fig. 2

Hierarchical clustering of changes in the expression of genes encoding transcripition factors. Hierarchical trees were drawn, based on log₂ fold change in relative expression of 476 genes between cold acclimated (CA) and deacclimated and between cold acclimated and non-acclimated (NA) Arabidopsis plants. Plants were cold acclimated at 4 °C for three days and thereafter deacclimated at 20 °C for 2 h, 4 h, 6 h, 12 h or 24 h. Genes were selected based on ANOVA analysis to be differentially regulated at least at one time point with a log₂ fold change of at least + or −1. Lists with the names of all genes in the different clusters indicated by the letters a to f can be found in Additional file 4