Yajie Duan: Key Laboratory of Tropical Fruit Biology, Ministry of Agriculture, Chinese Academy of Tropical Agricultural Science, South Subtropical Crop Research Institute, Zhanjiang, 524091, China.
Jian Chen: College of Food Science and Technology, Hainan University, Haikou, 570228, China.
Wei He: College of Food Science and Technology, Hainan University, Haikou, 570228, China.
Jingjing Chen: Key Laboratory of Tropical Fruit Biology, Ministry of Agriculture, Chinese Academy of Tropical Agricultural Science, South Subtropical Crop Research Institute, Zhanjiang, 524091, China.
Zhencai Pang: Key Laboratory of Tropical Fruit Biology, Ministry of Agriculture, Chinese Academy of Tropical Agricultural Science, South Subtropical Crop Research Institute, Zhanjiang, 524091, China.
Huigang Hu: Key Laboratory of Tropical Fruit Biology, Ministry of Agriculture, Chinese Academy of Tropical Agricultural Science, South Subtropical Crop Research Institute, Zhanjiang, 524091, China. huhuigang@sina.com.
Jianghui Xie: Key Laboratory of Tropical Fruit Biology, Ministry of Agriculture, Chinese Academy of Tropical Agricultural Science, South Subtropical Crop Research Institute, Zhanjiang, 524091, China. 313972374@qq.com. ORCID
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% KHPO, 0.05% MgCl, 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.
