Streptomyces mutants and protoplast regeneration as tools for biocontrol of plant pathogenic fungi [electronic resource].

Includes reference.

Sixteen Streptomyces cultures,i.e, four wild type strains, eleven mutants and one regenerated protoplast isolate were tested for their abilities to inhibit one or more of three local isolates of the plant pathogenic fungi, Fusarium solani, Rhizoctonia solani and Sclerotium rolfsii. which cause root rot disease. Bacillus subtitles was used to measure the antibacterial antibiotic activity of Streptomyces strains and mutants. All tested cultures were antibacterial antibiotic producers except R1, G2 and Str. abus. Mutant R4 was the best antibacterial producer. The sixteen cultures were tested for their antifungal activity against Fusarium solani. All of them inhibited F. solani growth after three days of incubation. After seven days, the antifungal activities of two-strains, Str. albus and Str. Griseoviridis was lost. Antifungal activities of eight mutants increased by increasing incubation period. Mutants R2, R4 and G4 were the higher antifungal activity mutants against F. solani. The best producer was R2 mutant, either after three or seven days of incubation.

Summary in Arabic.

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