Abstract: Using an atmospheric and room temperature plasma(ARTP)jet to mutagenize a phenazine-1-carboxamide-producting strain Pseudomonas Chlororaphis P3, the mutant strain P3-9 with the highest phenazine-1-carboxamide(PCN)yield of more than 2 093 mg/L was obtained from the primary-screened 20 mutant ones, and it was 125% that by the original strain. Furthermore, single factor experiment was used to investigate the effects of varied nutrient factors on the PCN synthesis of P3-9. The results showed that the best carbon source and nitrogen source were glycerol and tryptone respectively. Adding Fe³⁺ or Fe²⁺ had a significant effect on PCN production, and no measurable effect while adding aromatic amino acids of phenylalanine, tryptophan and tyrosine. After the optimization, the PCN yield of strain P3-9 reached 2 810 mg/L, which was the highest yield of PCN by mutation breeding in the world so far.

Key words: phenazine-1-carboxamide, atmospheric and room temperature plasma, medium optimization