CHARACTERISTICS OF TOXINS FROM STRAINS OF PSEUDOMONAS-SYRINGAE PV ATROFACIENS

Pseudomonas syringae pv. atrofaciens, which is an agent causing wheat diseases, produces toxins. Arialysis of toxins from strain P. syringae pv. atrofaciens 1007 by high-pressure liquid chromatography revealed nine peaks. Six of them corresponded to syringomycin (or an analogous toxin) and three hydrophobic peaks with a low fungicidal activity corr esponded to toxins similar to lipodepsipeptides of P. syringae pv. syr ingae. Amino acid analysis of the integrated fraction including all th e nine peaks revealed the presence of Ala, Val, Dab, Ser, Arg, Leu, Gl y, Pro, Asp, Thr, Tyr, and Phe. All the 50 studied yeast strains of th e genera Cryptococcus, Bullera, Metschnicowia, Sporodiobolus, Rhodospo ridium, and Rhodotorula and bacterial strains of the species Pseudomon as putida, Pseudomonas fluorescens, Pseudomonas aeruginosa, and Staphy lococcus aureus were susceptible to toxins produced by strains P. syri ngae pv. atrofaciens 1007, IIPGR V8, and IUPGR V28.