After inoculation, the plates were incubated at 30 ºC for 48 hrs subsequently; colonies with pinkish pigment indicated PHB production isolates were also exposed to ultraviolet light (312 nm) to detect their lightness, after that these lighted plates were recorded positives PHB production and these isolates were selected for the subsequent experiments (Spiekermann et al., 1999). All experiments were performed in triplicates. The culture was maintained on sucrose/yeast extract agar and stored at