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    [Breeding of high-producing LI-F lipopeptide Paenibacillus polymyxa by protoplast fusion and differential expression analysis of fusion strains]. Yan Dong,Han Jinzhi,Bie Xiaomei,Lu Zhaoxin,Lü Fengxia,Zhao Haizhen,Zhang Chong Sheng wu gong cheng xue bao = Chinese journal of biotechnology Auxotrophic strains of N1-37 (Phe-) and N2-27 (His-), screened from mutations of Paenibacillus polymyxa JSa-9 previously, were used as the parent strains to screen high-producing LI-F antibacterial lipopeptide fusion strain through protoplast fusion with polyethylene glycol as a promote agent. Fusion strain F5-15 was obtained. Then the product of LI-F antibacterial lipopeptide was quantified by HPLC, and the difference of expression of the key genes of lipopeptide synthase between wild strain JSa-9 and the fusion strain was analyzed by real-time PCR. LI-F antibacterial lipopeptide yield of the fusion strain F5-15 was 3.1-fold of the original strain JSa9's, and the expression levels of the target genes were 10.48, 2.48, 2.1 and 11.8 fold of the initial strain JSa-9, respectively.