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Background   Fusarium  wilt of banana is one of the most destructive diseases in banana-growing regions worldwide. Soil-borne diseases and soil microbial communities are closely related. The screening of antagonistic bacteria from soil microorganisms in areas with  Fusarium  wilt of banana is of great practical significance for controlling this disease.    Results  A strain designated  FS-4  was isolated from healthy banana rhizosphere soil in an area affected by  Fusarium  wilt. This strain exhibited a significant antagonistic effect on the pathogen. Pot experiments revealed that the fermentation broth of strain  FS-4  not only decreased the incidence of banana Fusarium wilt, but also promoted the growth of banana seedlings. The strain was identified as  Streptomyces  ma. by its morphological, physiological, and biochemical characteristics and 16S rRNA gene sequence analysis. The culture and fermentation conditions for this strain were optimized by single-factor and response surface experiments. The optimum culture conditions for  Streptomyces  ma . FS-4  were as follows: peptone 0.5%, saccharose 2.4, 0.05% K 2 HPO 4 , 0.05% MgCl 2 , and 0.05% NaCl at an initial pH of 7.0; 180 g at 28 °C; and inoculation size of 6% for 62 h. The diameter of bacteriostasis circle for  Bacillus subtilis  reached 26.7 mm.    Conclusion   Streptomyces  ma . FS-4  is an important microbial resource as a biological agent for the control of plant pathogenic fungi and can be used to promote banana growth.

Fermentation optimization and disease suppression ability of a Streptomyces ma. FS-4 from banana rhizosphere soil