类球红细菌空间诱变效应研究

Space Mutation Effects of Rhodobacter Sphaeroides

目的利用空间诱变手段处理类球红细菌,通过诱变后菌株生理生化情况的变化,筛选辅酶Q10(CoQ10)高产菌株,为空间诱变手段筛选产业化菌株的应用提供实验和理论依据。方法利用返回式卫星搭载类球红细菌,检测搭载后菌株的抗逆性及发酵CoQ10能力。结果空间搭载后筛选到生长温度、pH值、盐浓度范围变宽,抗逆性增强的菌株,同时菌落颜色出现乳白色、粉红色等颜色变异菌株。从颜色变浅的变异菌株中筛选到一株CoQ10高产菌,发酵生产CoQ10比对照高73.13%。结论与传统单因素诱变方式相比,空间诱变是多因素综合作用,诱变效果明显,能获得高抗逆性和高CoQ10生产能力的突变株,可以作为产业化菌株筛选的诱变方式。

Objective To study mutagenic effects of spaceflight on physiological and biochemical parameters of Rhodobacter sphaeroides and select high-yield mutants in co-enzyme Q10（CoQ10） production for providing the experimental and theoretical basis for industrial production through mutagenic effects of spaceflight.Methods Variations in stress resistance and CoQ10 production of isolated strains were studied,the strain Rhodobacter sphaeroides was taken back by a recoverable satellite after 15 d flight in space.Results Compared to the control,the strain was characterized by highter NaCl tolerance and higher stress resistance,as well as with broader scope in growth temperature and pH value after spaceflight.The mutant colonies appeared white or pink which was different from their original red.The CoQ10 production of mutant 10 strain was increased by 73.13% much higher than that of control.Conclusion Spaceflight mutagenic effects on Rhodobacter sphaeroides shows to be multi-factor compared to the traditional single-factor mutagenesis methods.It can enhance stress resistance and increase CoQ10 production of isolated strains,and can be utilized in industrial microbial mutagenesis and breeding in the future.