Phosphorus Availability and Proton Efflux of Nodulated-root Varies among Common-bean Genotypes (Phaseolus vulgaris) in Rhizobox

摘要

In this study we compared between six RILs of (Phaseolus vulgaris L.) in growth, nodulation, phosphorus use efficiency for N_2 fixation and proton release in response to two levels of P in nutrient solution. For plants grown at 250 and 75 imol P pl~(-1) week~(-1) for 42 days. For this propose Glass house experiment in rhizobox was conducted to evaluate six common bean genotypes for their growth behavior at two levels of soil phosphorus, deficient (75 mmol week~(-1) plant~(-1)) and sufficient (250 mumol week~(-1) plant~(-1)) using 24g soil per rhizobox. Genotypes showed differential behavior at both P levels for all parameters. Shoot biomass and nodule biomass were observed higher in sufficient P than in deficient P. Difference for phosphorus utilization efficiency and phosphorus uptake were also observed where RILs 34,75 and 147 were the higher efficient in use and uptake of P under sufficient P than deficient P. and also greater in H~+ efflux for these RILs under sufficient than deficient P. It concluded that these RILs have the possibility to enrich the poor phosphorus soils by available P and improve the soil fertility.