[Mechanism of antimutagenic activity of Pseudomonas syringae lipopolysaccharides].
The antimutagenic activity of lipopolysaccharides of phytopathogenic bacteria,which are the agents of grain crops diseases, has been investigated using bacterial test-system with Salmonella typhimurium. It has been established that the greatest antimutagen activity of Pseudomonas syringae pv. atrofaciens and P. syringae pv. coronafaciens lipopolysaccharides was,if they and bichromate potassium be simultaneously added to cells test-strains of S. typhimurium. They decreased to a less degree quantity of His+ -revertants in S. typhimurium cells pretreated by potassium bichromate. Li popolysaccharides of pathovars of P. syringae do not increase test-strain cells resistance to mutagenic effect of potassium bichromate under pretreatment of S. typhimurium by them.