Gibberellic acid (GA3) producing efficient strain was isolated from rhizospheric soil of sugarcane in the vicinity of Surat city, India and characterized as Bacillus cereus according to standard methods. This isolate was tested for the gibberellic acid production in a Nutrient medium. Optimization of various physiological conditions (inoculum size, incubation temperature, pH of the growth media, incubation period, and incubation condition) were carried out to achieve maximum production of gibberellic acid. The highest 394.18µg/ml of gibberellic acid production was obtained in Nutrient broth after 9 days of incubation at 6.0 pH and 30°C temperature on a rotary shaker with the107 cells/ml of inoculum size.
Gibberellic acid, Sugarcane, Bacillus cereus
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