Integrating biocontrol efficacy and genomic potential of Bacillus velezensis BJ-1141: from broad-spectrum antagonism to tomato Fusarium wilt suppression
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ID: 321279
2026
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Abstract
Abstract Aims To isolate and characterize a rhizosphere-derived Bacillus velezensis strain with biocontrol and plant growth-promoting potential, and to evaluate its efficacy against plant pathogens together with its genomic basis. Methods and Results A bacterial strain (BJ-1141) was isolated from the rhizosphere and identified as B. velezensis based on morphological characteristics and phylogenetic analyses of 16S rRNA and gyrA gene sequences. The strain exhibited broad-spectrum antagonistic activity against 24 plant pathogenic fungi, inhibiting 23 pathogens by more than 50%, with a maximum inhibition rate of 95.57%. BJ-1141 produced hydrolytic enzymes (amylase, protease, cellulase and pectinase) and plant growth-promoting factors, including siderophores and indole-3-acetic acid (IAA). It also demonstrated phosphorus solubilization, nitrogen fixation and biofilm formation. Greenhouse experiments showed that root application of BJ-1141 effectively controlled tomato Fusarium wilt caused by Fusarium oxysporum f. sp. lycopersici, achieving control efficacies of 81.13 - 85.93%, which were higher than those of chemical and commercial microbial treatments. In addition, BJ-1141 significantly increased plant height, biomass and chlorophyll content in tomato and lettuce seedlings. Whole-genome sequencing revealed a 3 902 965 bp genome containing 13 biosynthetic gene clusters associated with antimicrobial secondary metabolites, including surfactin, fengycin, bacillaene, difficidin, macrolactin H, bacillibactin and bacilysin. Conclusions B. velezensis BJ-1141 is a multifunctional bacterial strain with strong biocontrol efficacy and plant growth-promoting traits, supported by genomic evidence, and represents a promising candidate for sustainable crop disease management.
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| Authors | Yuehua Chen, Mei Liu, Wei Zhang, Manawaduge Ayesha Madushani, Cong Jiang, Qikai Xing, Chenfang Wang, Jiye Yan |
| Journal | Journal of applied microbiology |
| Year | 2026 |
| DOI |
10.1093/jambio/lxag176
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| URL | |
| Keywords | Keywords not found |
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