PGPR, best substituent for chemical compounds in cultivation of commercial crops.

Abstract

In Indian economy agronomy sector is huge and many other sector is dependent. Food need is increasing rapidly and for these demand many farmers are using chemical fertilizers and pesticides in agriculture activity. Due to use of huge amount of xenobiotics it leads to bio magnifications. Rhizosphere is the centre of intense biological activity due to the food supply provided by the root exudates. Rhizosphere bacteria colonizing the rhizosphere and conferring beneficial effects are called Plant growth promoting rhizo bacteria (PGPR).
Rhizo bacteria were isolated from rhizospheric soil of Jalna, Maharashtra State, India. Out of 35 isolates 10 potential isolates were screened which showed high phosphate solubilization and ability to grow on nitrogen free medium. Phosphate solubilization was studied both quantitatively and qualitatively. Temperature and pH growth optimization parameters for phosphate solubilization were studied. From these ten isolates four showed Siderophore producing activity when grown on deferrated Succinate Minimal medium. Only one isolate showed the capability of producing exopolysaccharide. In the present study antibiotic resistant activity was also studied. The results demonstrated that the use of these PGPR as an inoculants carrier for seed dressing of commercial crop has a promising effect on seed germination.