Joint International Research Laboratory of Soil Health, Jiangsu Provincial Key Lab for Organic Solid Waste Utilization, Key Lab of Bio-interaction and Plant Health, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, National Engineering Research Center for Organic-based Fertilizers, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, People's Republic of China.
Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, China.
Environ Microbiol. 2022 Dec;24(12):5680-5689. doi: 10.1111/1462-2920.16184. Epub 2022 Sep 26.
Microbial interactions within resident communities are a major determinant of resistance to pathogen invasion. Yet, interactions vary with environmental conditions, raising the question of how community composition and environments interactively shape invasion resistance. Here, we use resource availability (RA) as a model parameter altering the resistance of model bacterial communities to invasion by the plant pathogenic bacterium Ralstonia solanacearum. We found that at high RA, interactions between resident bacterial species were mainly driven by the direct antagonism, in terms of the means of invader inhibition. Consequently, the competitive resident communities with a higher production of antibacterial were invaded to a lesser degree than facilitative communities. At low RA, bacteria produced little direct antagonist potential, but facilitative communities reached a relatively higher community productivity, which showed higher resistance to pathogen invasion than competitive communities with lower productivities. This framework may lay the basis to understand complex microbial interactions and biological invasion as modulated by the dynamic changes of environmental resource availability.
微生物在定居群落内的相互作用是决定其对病原体入侵抗性的主要因素。然而，这些相互作用会随环境条件而变化，这就提出了一个问题，即群落组成和环境如何相互作用来塑造入侵抗性。在这里，我们以资源可用性（RA）作为改变模式细菌群落对植物病原细菌丁香假单胞菌侵染抗性的模型参数。我们发现，在高 RA 下，居民细菌种间的相互作用主要是由直接拮抗作用驱动的，这是通过入侵抑制的手段来实现的。因此，具有更高抗菌物质产生能力的竞争型常驻群落比促进型群落受到的入侵程度要小。在低 RA 下，细菌产生的直接拮抗潜力较小，但促进型群落达到了相对较高的群落生产力，这表现出比生产力较低的竞争型群落更高的抵御病原体入侵的能力。这个框架可能为理解复杂的微生物相互作用和生物入侵提供基础，这些作用和入侵是由环境资源可用性的动态变化所调节的。
