Rhizosphere-induced genes for cellular functions in Rlv3841. Genes elevated by three-fold or more (P ≤ 0.05) are color coded for the rhizospheres: black, all; green, pea-specific; blue, legume-specific; purple, alfalfa and sugar beet; gold, pea and sugar beet. An induced gene is considered to be also elevated in further rhizospheres where expression was elevated by two-fold or more (Additional file 8). Asterisks indicate Nod factor is exported by a specific transport system whose expression was elevated (Figure 1). aGenes are part of an induced operon and elevated ≥ 1.7-fold; bgenes induced ≥ 3-fold, P ≤ 0.08; cgene considered up-regulated in the pea rhizosphere (1.8-fold elevated). Genes underlined have been mutated and results of their competitiveness in the rhizosphere are shown in Additional file 8.