2. Materials and methods
2.1. Collection and culture of S. citreofluorescens The strain of S. citreofluorescens was obtained from Microbial Type Culture Collection and Gene Bank (MTCC-2528) Institute of Microbial Technology, Chandigarh India.S. citreofluorescens were maintained on autoclaved Potato
Dextrose Broth media (infusion of potatoes 200.0g, dextrose
20 g, deionized water 1 000 mL and adjust pH to 7.2 with KOH).