Mapman representation of differential gene expression for the mature root and root tips under altered P supply. Comparison of gene expression in the mature root cluster root and non-cluster root (A, MCR vs. MR) and root tips (B, TCR vs TR), i.e. P-deficient versus P-sufficient tissues for genes involved in primary metabolism. In the comparison of P/+P mature root many genes related to the TCA cycle, glycolysis or Calvin cycle showed higher expression in the MCR than in the MR while such a response was not observed for the root tips. Here, with the exception of PEPC, only genes directly involved in P homeostasis or lipid remodelling showed higher expression in the TCR. Given are log2 values for corresponding FPKM ratios. Red colour highlights up-regulated, green colour down-regulated genes.