Appl Environ Microbiol. 1996 Mar;62(3):1112-5. doi: 10.1128/aem.62.3.1112-1115.1996.
The type strains of all known species and biovars of the Lactococcus genus were tested for the presence of plasmids, lactose genes, and insertion sequences cloned from the lactose plasmid of Lactococcus lactis subsp. lactis. Only the biovar xylosus of this subspecies is plasmid free. The lactose plasmid is present only in lactose-positive strains except in Lactococcus plantarum. The distribution of insertion sequences varies within the type strains of the Lactococcus genus.
所有已知的乳球菌属种和生物型的模式菌株都被测试了质粒、乳糖基因和从乳球菌乳亚种乳糖质粒克隆的插入序列的存在情况。只有这个亚种的木糖生物型是无质粒的。乳糖质粒仅存在于乳糖阳性菌株中,除了植物乳杆菌。插入序列在乳球菌属的模式菌株中的分布情况有所不同。