Fig. 4
Heat maps of selected differentially expressed genes of Arctic Mesorhizobium strain N33. Genes were selected from 73 genomic clones/contigs (Additional file 4), grouped by clusters of orthologous group (COG) category from T to R (see Additional file 6), and described by gene ontology (GO). Comparisons between transcriptomics data sets of different cold treatment conditions (GT4, T1, T2, T3, T4, T5, and GT10) are shown in columns. Values are expressed as ratio fold changes (−6.67 to 3.71). The 52 selected genes were differentially expressed in at least one data set (p < 0.005, ≥ ± 1.5 FC), and the corresponding data is available in Additional file 6. Gene expression fold-change ranges from black (up regulation) to light grey (down regulation)