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Journal of Biological Sciences
Year: 2008  |  Volume: 8  |  Issue: 5  |  Page No.: 914 - 919

A Comparison Between Antibiotic-Resistant Mutants of Antagonistic Bacteria and Their Wild Types in Biological Control of Cotton Seedling Damping-Off Disease

H. Jahanifar, A. Heydari, N. Hasanzadeh, H.R. Zamanizadeh, S. Rezaee and L. Naraghi    

Abstract: In this research, antibiotic-resistant mutants of antagonistic bacteria to rifampicin (Rif) and nalidixic acid (Nal) were developed via spontaneous mutation and their effectiveness in controlling cotton seedling damping-off disease was compared with their wild types. Four wild types isolates belonged to Pseudomonas fluorescens and their mutants were tested against pre-and post emergence damping-off disease of cotton in greenhouse. The experiment was conducted in a completely randomized design with ten treatments and four replicates. A virulent isolate of Rhizoctonia solani, the causal agent of cotton seedling damping-off disease was used in the study and the effectiveness of bacterial isolates was evaluated based on the number of healthy seedlings 15, 30, 45 and 60 days after sowing. Results indicated that all Rif-Nal resistant mutants showed more effectiveness in disease control than their wild types 15 and 30 days after sowing. However, at days 45 and 60 after sowing, only three mutants were more effective than their wild types in controlling cotton seedling damping-off disease. Results of this study suggest that spontaneous mutation may affect and enhance the activity and performance of antagonistic bacteria.

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