MICROBIAL POLYGLUCOSAMINE PGB-2 SECRETED BY CITROBACTER SP. BL4 AND USE OF THE SAME

摘要

A novel Citrobacter sp. BL4 is provided to be able to produce microbial polyglucosamine PGB-2 having high ratio of D-glucosamine, high molecular stability and water-solubility and strong elicitor activity without toxicity against animal and plant, thereby being useful as a liquid phase/powdery fertilizer raw material for plant physiological activity and promoting growth, a seed treatment agent and an environmental-friendly biochemical pesticide material. The Citrobacter sp. BL4 having microbial polyglucosamine PGB-2 producing capacity is deposited as a deposition number of KACC 91177P. The method for preparing polyglucosamine PGB-2 comprises the steps of: (a) culturing the Citrobacter sp. BL4 to secret and generate the polyglucosamine PGB-2 from a culture solution; and (b) recovering the polyglucosamine PGB-2 from the culture solution. The polyglucosamine PGB-2 prepared by the method comprises 90-99 wt.% of D-glucosamine and 1-10 wt.% of rhamnose.