Barnet Y M
Can J Microbiol. 1980 May;26(5):572-6. doi: 10.1139/m80-101.
The effect of rhizobiophages CT3 and CT4 on Rhizobium trifolii SU91 and SU36, respectively, was examined. These phage-susceptible strains were used, either singly or paired with a competing phage-resistant type as inoculum for Trifolium subterraneum plants growing in vitro in agar medium. Addition of bacteriophage to single strain experiments produced no significant effects on total bacterial numbers, nodulation, or plant dry weight. However, when phages were added to the paired inocula, significant decreases in counts of the susceptible strain were observed, frequently accompanied by a rise in numbers of the resistnt type. An increase in the proportion of ineffective variants of the susceptible rhizobia was also observed, although plant dry weights and nodule numbers were not altered. These effects were dependent only upon a difference in phage susceptibility of the bacteria and were obtained even when the competing strain was only partially resistant and a relativly poor competitor.
研究了根瘤菌噬菌体CT3和CT4分别对三叶草根瘤菌SU91和SU36的影响。这些对噬菌体敏感的菌株，单独使用或与一种竞争性的噬菌体抗性菌株配对，作为接种物用于在琼脂培养基中体外生长的地下三叶草植物。在单菌株实验中添加噬菌体对细菌总数、结瘤或植物干重没有显著影响。然而，当将噬菌体添加到配对接种物中时，观察到敏感菌株的数量显著减少，同时抗性类型的数量经常增加。还观察到敏感根瘤菌无效变体的比例增加，尽管植物干重和根瘤数量没有改变。这些影响仅取决于细菌对噬菌体敏感性的差异，即使竞争菌株只是部分抗性且竞争力相对较弱时也会出现这些影响。
