Our aim was to determine whether there is a synergistic interaction between the arbuscular mycorrhizal (AM) fungus Rhizoglomus intraradices and the bacterium Brevibacterium frigoritolerans, and to understand how R. intraradices and B. frigoritolerans affect the competitive growth of Flaveria bidentis (L.) Kuntze in nutrient-deficient soil. Pot culture of F. bidentis and Eclipta prostrata (L.) L. under nutrient-limited soil conditions was used to test the effect of R. intraradices and B. frigoritolerans on the competitive growth of F. bidentis. Inoculation with B. frigoritolerans and co-inoculation with R. intraradices and B. frigoritolerans increased the biomass of F. bidentis, and a single inoculation of B. frigoritolerans gave E. prostrata a competitive advantage over F. bidentis. However, we found higher R. intraradices colonization of exotic F. bidentis roots than native E. prostrata roots. R. intraradices and B. frigoritolerans probably play different roles in the invasion of F. bidentis. R. intraradices may give the invader a competitive advantage through the accumulation of higher foliar levels of N, and B. frigoritolerans may facilitate the uptake of available N from the soil. Therefore, the results support the hypothesis that the AM fungus-soil bacteria cooperation makes N available to F. bidentis and facilitates its competitive growth.

中文翻译：

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Rhizoglomus intraradices 和相关的Brevibacterium frigoritolerans 增强Flaveria bidentis 的竞争性生长

我们的目的是确定丛枝菌根 (AM) 真菌根内根际 (Rhizoglomus intraradices) 和细菌 frigoritolerans 短杆菌之间是否存在协同相互作用，并了解 R. intraradices 和 B. frigoritolerans 如何影响 Flaveria bidentis (L.) Kuntze 的竞争性生长在营养缺乏的土壤中。F. bidentis 和 Eclipta prostrata (L.) L. 在营养有限的土壤条件下的盆栽培养用于测试 R. intraradices 和 B. frigoritolerans 对 F. bidentis 竞争性生长的影响。用 B. frigoritolerans 接种以及与 R. intraradices 和 B. frigoritolerans 共同接种增加了 F. bidentis 的生物量，并且单次接种 B. frigoritolerans 使 E. prostrata 比 F. bidentis 更具竞争优势。然而，我们发现外来 F. bidentis 根比原生 E. prostrata 根。R. intraradices 和 B. frigoritolerans 可能在 F. bidentis 的入侵中扮演不同的角色。R. intraradices 可以通过在叶面积累更高水平的 N 来为入侵者提供竞争优势，而 B. frigoritolerans 可以促进土壤中有效 N 的吸收。因此，结果支持 AM 真菌-土壤细菌合作使 N 可用于 F. bidentis 并促进其竞争性生长的假设。