Differential expression of gene identified by GO term enrichment analysis and of transcription factors. A) Shown is differential expression of genes associated to enriched GO terms in Cluster 1 (cell cycle, auxin, root development) and Clusters 2 + 3 (oxidative stress, response to iron) of the hierarchical cluster analysis (Figure 4). Additionally, white lupin homologs for two genes involved in cytokinin signalling, cytokinin oxidase (CKX) and the cytokinin receptor CRE1 are presented. For contigs the name of the identified homologous Arabidopsis genes are given. Gene abbreviations are: FBA, FRUCTOSE 1,6 BIPHOSPHATE ALDOLASE; NDPK,NUCLEOSIDE DIPHOSPHATE KINASE; PRX, PEROXIDASE. For other gene abbreviations see Figure 4. B) Differentially expressed transcription factors shown as pair-wise comparisons for non-cluster root and cluster root tissues, respectively. Individual genes were grouped into the corresponding TF families. Gene abbreviations: ERF, ETHYLENE RESPONSE FACTOR; HB2, HOMEOBOX PROTEIN2; MGP, MAGPIE; PHB, PHABULOSA; PHV, PHAVOLUTA; PLT, PLETHORA; RSL, ROOT HAIR DEFECTIVE SIX-LIKE; SCR, SCARECROW; UPB1, UPBEAT1; WOX, WUSCHEL-RELATED HOMEOBOX. Differential expression of genes in the tissues of the P-sufficient root and P-deficient cluster root tissues in A) and B) are given as log2 of the FPKM ratios.