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常压室温等离子体诱变选育丁烯基多杀菌素高产菌株及培养基优化
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Breeding of Butenyl-spinosyns Producing Strain by Atmospheric Room Temperature Plasma and Optimization of Culture Medium
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    摘要:

    以ASAGF 2-G4为出发菌株,进行常压室温等离子体与2 mg/mL亚硝基胍的复合诱变选育。结合96孔板发酵培养进行了初筛及摇瓶复筛后,共得到高产突变菌株5株,经复筛验证获得1株高产且稳定遗传菌株2-A9,其比出发菌株产量提高30.92%。利用Pulckett-Burman实验设计筛选发酵培养基中的影响因素,得到葡萄糖、糊精、棉籽蛋白、玉米浆干粉为显著因素。利用Box-Behnken响应面实验设计优化4种影响因素,获得最优培养基配方为(g/L):葡萄糖60.0、糊精25.0、棉籽蛋白25.0、玉米浆干粉12.5、胨化牛奶10.0、MgSO4 1.0、NaCl 2.0、CaCO3 5.0。经重复实验验证后,丁烯基多杀菌素平均产量与预测产量接近,表明该模型可行有效。

    Abstract:

    The original strain ASAGF 2-G4 was applied to undergo Atmospheric Room Temperature Plasma (ARTP) mutagenesis of various doses and 2 mg/mL NTG compound mutagenesis of different action durations. Five high-yield mutant strains were obtained after preliminary screening through 96-orifice-plate fermentation and re-screening in shake flasks. At last, a high-yielding mutant strain 2-A9 was selected, which increased the yield by 30.92% compared with the original strain after genetic stability verification. A high-yield mutant ASAGF 2-A9 was applied as the starting strain, the experiment design Plackett-Burman was used to screen the factors affecting the fermentation media, with a conclusion that factor glucose, dextrin, cottonseed protein and corn starch is a significant factor affecting butenyl-spinosyns. The experimental design Box-Behnken was applied to optimize the factors significantly affecting the experiment Plackett-Burman. The optimal growing media components were deduced as follows (g/L): glucose 60.0, dextrin 25.0, cottonseed protein 25.0, coen steep dry powder 12.5, peptone milk 10.0, MgSO4 1.0, NaCl 2.0, CaCO3 5.0. It’s verified that the average output of butenyl- spinosyns is close to the predicted value, indicating that the model is feasible and effective.

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张逍遥,郭 超,王靖楠,刘艳丽,王 超*.常压室温等离子体诱变选育丁烯基多杀菌素高产菌株及培养基优化[J].粮油食品科技,2022,30(1):174-181.

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  • 在线发布日期: 2022-01-27
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