Kong Zhaoyu, Liu Hongguang
School of Life Science, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang University, Nanchang, China.
Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention, Jiangxi Academy of Water Science and Engineering, Nanchang, China.
Front Plant Sci. 2022 May 26;13:920813. doi: 10.3389/fpls.2022.920813. eCollection 2022.
Plant beneficial bacteria, defined as plant growth-promoting rhizobacteria (PGPR), play a crucial role in plants' growth, stress tolerance and disease prevention. In association with the rhizosphere of plants, PGPR facilitate plant growth and development either directly or indirectly through multiple mechanisms, including increasing available mineral nutrients, moderating phytohormone levels and acting as biocontrol agents of phytopathogens. It is generally accepted that the effectiveness of PGPR inoculants is associated with their ability to colonize, survive and persist, as well as the complex network of interactions in the rhizosphere. Despite the promising plant growth promotion results commonly reported and mostly attributed to phytohormones or other organic compounds produced by PGPR inoculants, little information is available on the potential mechanisms underlying such positive effects modifying rhizosphere microbial community and soil functionality. In this review, we overviewed the effects of PGPR inoculants on rhizosphere microbial ecology and soil function, hypothesizing that PGPR may indirectly promote plant growth and health modifying the composition and functioning of rhizosphere microbial community, and highlighting the further directions for investigating the role of PGPR in rhizosphere from an ecological perspective.
植物有益细菌，即被定义为植物促生根际细菌（PGPR）的细菌，在植物生长、胁迫耐受性和疾病预防中发挥着关键作用。与植物根际相关联，PGPR通过多种机制直接或间接地促进植物生长和发育，包括增加有效矿物质养分、调节植物激素水平以及充当植物病原体的生物防治剂。人们普遍认为，PGPR接种剂的有效性与其定殖、存活和持续存在的能力以及根际复杂的相互作用网络有关。尽管通常报道了有前景的植物生长促进结果，且大多归因于PGPR接种剂产生的植物激素或其他有机化合物，但关于这种积极作用改变根际微生物群落和土壤功能的潜在机制的信息却很少。在本综述中，我们概述了PGPR接种剂对根际微生物生态学和土壤功能的影响，假设PGPR可能通过改变根际微生物群落的组成和功能间接促进植物生长和健康，并强调了从生态学角度研究PGPR在根际中作用的进一步方向。
