بر روي قارچ عامل بيماري مرگ گياهچه لوبيا )Pseudomonas Fluorescens( مطالعه اثر آنتا گونيستي برخي از جدايه هاي

Stady on antagonistic effect of several Pseudomons fluorescens isolates on casual agent of bean seedling damping-off

In this study one hundred twenty pseudomons fluorescens isolates were collected by use of Kinʹs R medium from field soils of different reigones Khuzestan province including: Dezful, Shoshtar, Shosh, Mollasani and Sosangerd. Only three isolates had suitable antagonistic and biological effects on Rhizoctonid solani. the casual agent of been seedling damping off in laboratory experiments. These strain were identified by current methods in bacteriology and belonged to pseudomons fluorescens. Each strain showed significant effect on dead plant percent reduction in compare with check. but effect of strain 24 was more than the others. These bacterial strains produced a kind of metabolite on PDA (containing 5% glucose) that could inhibit the growth of casual agent of seed rots and seeding damping off in the absence of bacteria. This metabolite seems to be an antibiotic. Any one of strain did not produce siderophor on PDA (containing 5% glucose) amended with different concentration of FeC1.