Is genotypic variation of H⁺ efflux under P deficiency linked with nodulated-root respiration of N₂ fixing common-bean (Phaseolus vulgaris L.)?

To examine genotypic variation of common bean in growth, phosphorus uptake, nodulated-root proton release, and nodule gas permeability, seven common bean recombinant inbred lines (RIL) from the cross of BAT477×DOR364 were inoculated by Rhizobium tropici CIAT 899 and grown in hydroaeroponic culture under glasshouse conditions. A positive correlation was observed between shoot and nodule biomass for most of the studied RILs. Under P deficiency, the tolerant common bean RILs acidified more of their rhizosphere than the sensitive ones.