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Streptomyces spp. were isolated from rhizosphere in fallow lands. The Streptomyces spp. were identifiedas Streptomyces griseus (MSS181), Streptomyces griseoaurantiacus (MSS269), Streptomyces microflavus (MSS275),Streptomyces herbaricolor (MSS276) based on 16S rRNA gene sequences. Afterwards, cucumber, pepper, tobaccoand tomato were drenched with the isolates at early growth stages and plant growth such as height and dry weightof plants was measured. By treatment of Streptomyce spp., plant height of cucumber was increased by 16-29%compared to the control, But there were no statistically significant differences in dry weight. When the sameisolates were treated on chili-pepper, plant height and dry weight of chili-pepper were increased respectively by 10-19% and 19-25% compared to the control. The dry weight of tobacco and tomato were increased by 44-73% and65-165%, respectively compared to the control. When antifungal activities of the isolates were tested against plantpathogenic fungi, Streptomyces microflavus (MSS275) effectively inhibited the mycelial growth of Phytophthoracapsici, Fusarium oxysporum, Rhizoctonia solani and Sclerotinia sclerotiorum.Key words Streptomyces, Plant growth promotion |
