Effect of phosphorous
solubilizing bacteria on the rhizobia – legume simbiosis
Susana B. Rosas*, Marisa Rovera, Javier
Andrés, Néstor S. Correa
Lab
Fisiologia Vegetal. Fac Cs Exactas Fco Qcas y Naturales. Campus Universitario
5800 Río Cuarto (Cba) ARGENTINA
Alfalfa and soybean are the leguminous most important in the
agricultural system of the semi-arid region of Argentina. Since in this region
the available phosphorus distribution (Pd) is not uniform, the possible action
of phosphorus solubilizing bacteria on the leguminous – rhizobia
simbiosis is studied. The strains
used were Sinorhizobium meliloti 3DOh13 , excellent solubilizer
of Fe and P for alfalfa, Bradyrhizobium japonicum TIIIB for soybean and two
strains of Pseudomonas putida (Sp21 and Sp22) solubilizers of P for the
treatments of growth promotion through an improvement in the nodulation and
nitrogen biological fixing. The rhizobia strains assayed are capable of coexisting with Pseudomonas, being observed
meaningful differences in
percentage of nodulation and air portion in soybean co-inoculated.