Physiochemical Characterization of PGPR Isolates of Rhizobial Strains from Shekhawati Region in India

Soils contain natural reserves of plant nutrients, but these reserves are largely in forms unavailable to plants, and only a minor portion is released each year through biological activity or chemical processes. For optimum plant growth, nutrients must be available in sufficient and balanced quantities. Nitrogen being an essential component of proteins and nucleic acids plays an important role in improving the crop production. A study on physiochemical characterization viz., physiological, biochemical characteristics and antibiotic resistance signifies that rhizobial strains were sensitive to pH and antibiotic like rifampicin and ciproflaxin. It was also concluded that these rhizobial bacterial strains utilize glucose, arabinose and sorbitol as sole carbon source.