食品科学 ›› 2008, Vol. 29 ›› Issue (11): 456-459.

• 生物工程 • 上一篇    下一篇

蛋氨酸高产菌株诱变育种

 闵伟红, 林小秋, 冯琦, 胡耀辉   

  1. 吉林农业大学食品科学与工程学院;
  • 出版日期:2008-11-15 发布日期:2011-12-08

Study on Mutation Breeding of High Methionine Producing Strain from Corynebacterium pekinense AS1.299

 MIN  Wei-Hong, LIN  Xiao-Qiu, FENG  Qi, HU  Yao-Hui   

  1. College of Food Science and Engineering,Jilin Agricultural University,Changchun 130118,China
  • Online:2008-11-15 Published:2011-12-08

摘要: 本实验以北京棒杆菌AS1.299作为出发菌株,采用紫外线和亚硝基胍(NTG)作为诱变剂,进行诱变育种,以期获得蛋氨酸高产菌株。研究结果表明:紫外诱变菌悬液最佳菌浓度为103CFU/ml,最佳紫外照射时间为18s;NTG诱变最佳菌浓度为102CFU/ml,NTG诱变的最佳诱变时间为40min;通过三轮紫外和NTG交替诱变处理后可提高该菌株蛋氨酸产量,其中突变株N3-10蛋氨酸产量为1.103g/L,比原菌株蛋氨酸产量增加了0.703g/L,5次传代表现出较好的遗传稳定性。

关键词: 蛋氨酸, 诱变育种, 发酵

Abstract: Corynebacterium pekinense AS1.299 was mutagenized with ultraviolet(UV) and N-methyl-N’-nitro-nitrosoguanidine(NTG) to screen high methionine-producing strain in this study.Results showed that for the Corynebacterium pekinense AS1.299 suspension,the optimal conditions of UV mutagenesis are bacterial concentration 103 CFU/ml and UV exposure time 18 s,and the optimal conditions of NTG mutagenesis are NTG concentration 102 CFU/ml and treatment time 40 min.After three-circle alternation of UV and NTG mutagenesis,the methionine productivity of the mutant strain is 1.103 g/L,0.703 g/ L higher than that of original strain.After five passagings,its genetic stability is still good.

Key words: methionine, mutation breeding, fermentation