Influence of Fertilizer Level on Establishment of Lacz Tagged Mutants of Pseudomonas striata in Soybean Rhizoshpere
نویسندگان
چکیده
The fates of Pseudomonas striata (P-27) and its mutant were compared in the rhizosphere of soybean at different fertilizer level. Three lacZ tagged mutant strains designated as superior, inferior and homologous to parent with respect to P-solubilization (T-80, T-128, T-125) and IAA production (T-49, T-57, T-87) were selected for establishment studies. The comparison of mutants for their ability to survive and establish in soybean rhizosphere revealed, a linear decline of the population with plant growth period. Individual pot experiments were conducted with superior strains to study the influence of level of fertilizer on phosphobacterial population in rhizosphere and crop growth. It is concluded that inoculation of P. striata strain increases the population of phosphobacteria and growth parameters of soybean irrespective of the level of fertilizer. The application of fertilizer beyond 50% of the recommended dose was found to be relatively unresponsive.
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