Abstract：
Co-incubation of plant growth promoting rhizobacteria (PGPRs) have been proposed as a potential alternative to pesticides for controlling fungal pathogens in crops, but their synergism mechanisms are not yet fully understood. In this study, combined use of Bacillus subtilis SL44 and Enterobacter hormaechei Wu15 could decrease the density of Colletotrichum gloeosporioides and Rhizoctonia solani and enhance the growth of beneficial bacteria on the mycelial surface, thereby mitigating disease severity. Meanwhile, PGPR application led to a reorganization of the rhizosphere microbial community through modulating its metabolites, such as extracellular polymeric substances and chitinase. These metabolites demonstrated positive effects on attracting and enhancing conventional periphery bacteria, inhibiting fungal pathogens and promoting soil health effectively. The improvement in the microbial community structure altered the trophic mode of soil fungal communities, effectively decreasing the proportion of saprotrophic soil and reducing fungal plant diseases. Certain combinations of PGPR have the potential to serve as precise instruments for managing plant pathogens.
摘要：
植物生长促进根际细菌（PGPR）的共孵育已被提出作为控制作物中真菌病原体的农药的潜在替代品。但是它们的协同机制还没有完全理解。在这项研究中,枯草芽孢杆菌SL44和ormaechei肠杆菌Wu15的联合使用可以降低炭疽病和solani根瘤菌的密度，并增强菌丝体表面有益菌的生长，从而减轻疾病的严重程度。同时,PGPR的应用通过调节其代谢物导致根际微生物群落的重组，如胞外聚合物和几丁质酶。这些代谢物在吸引和增强常规外周细菌方面表现出积极作用，有效抑制真菌病原体，促进土壤健康。微生物群落结构的改善改变了土壤真菌群落的营养模式，有效降低腐化土壤的比例，减少真菌植物病害。PGPR的某些组合具有作为管理植物病原体的精确仪器的潜力。
