Stallions D R, Curtiss R
J Bacteriol. 1971 Mar;105(3):886-95. doi: 10.1128/jb.105.3.886-895.1971.
Haploid recombinant yield is reduced in matings conducted at 42.5 C between deoxyribonucleic acid (DNA) temperature-sensitive [dna(-)(TS)] recipients unable to synthesize DNA at 42.5 C and any of the three major donor types (Hfr, F(+), F') of Escherichia coli. No such reduction is observed in matings conducted at 42.5 C when the dna(-)(TS) mutation is in the donor parent. Evidence is presented which indicates that chromosome transfer from donors to recipients unable to replicate DNA at 42.5 C during vegetative growth occurs at normal frequencies when the mating is conducted at 42.5 C. It is concluded that some stage in haploid recombinant formation is adversely affected in dna(-)(TS) recipients mated at the temperature restrictive for DNA synthesis.
在42.5℃下进行的交配中,脱氧核糖核酸(DNA)温度敏感型[dna(-)(TS)]受体在该温度下无法合成DNA,与大肠杆菌的三种主要供体类型(高频重组菌Hfr、F(+)、F')交配时,单倍体重组体产量会降低。当dna(-)(TS)突变存在于供体亲本中时,在42.5℃下进行的交配中未观察到这种产量降低。有证据表明,在营养生长期间无法在42.5℃复制DNA的受体与供体之间进行交配时,当交配在42.5℃进行时,染色体从供体转移到受体的频率正常。得出的结论是,在对DNA合成具有温度限制性的温度下进行交配时,dna(-)(TS)受体中单倍体重组体形成的某个阶段受到了不利影响。