Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/42810
Title: Mycorrhizal networks facilitate the colonization of legume roots by a symbiotic nitrogen-fixing bacterium
Keywords: Arbuscular mycorrhizal fungi
Plant symbioses
Bacterial migration
Extraradical mycelium
Common mycorrhizal network
Micorriza arbuscular
Bactérias fixadoras de nitrogênio
Plantas - Simbiose
Migração bacteriana
Micélio extrarradicular
Issue Date: Mar-2020
Publisher: Springer Nature
Citation: NOVAIS, C. B. de et al. Mycorrhizal networks facilitate the colonization of legume roots by a symbiotic nitrogen-fixing bacterium. Mycorrhiza, [S. I.], v. 30, p. 389–396, 2020. DOI: https://doi.org/10.1007/s00572-020-00948-w.
Abstract: Arbuscular mycorrhizal fungi (AMF) absorb and translocate nutrients from soil to their host plants by means of a wide network of extraradical mycelium (ERM). Here, we assessed whether nitrogen-fixing rhizobia can be transferred to the host legume Glycine max by ERM produced by Glomus formosanum isolate CNPAB020 colonizing the grass Urochloa decumbens. An H-bridge experimental system was developed to evaluate the migration of ERM and of the GFP-tagged Bradyrhizobium diazoefficiens USDA 110 strain across an air gap compartment. Mycorrhizal colonization, nodule formation in legumes, and occurrence of the GFP-tagged strain in root nodules were assessed by optical and confocal laser scanning microscopy. In the presence of non-mycorrhizal U. decumbens, legume roots were neither AMF-colonized nor nodulated. In contrast, G. formosanum ERM crossing the discontinuous compartment connected mycorrhizal U. decumbens and G. max roots, which showed 30–42% mycorrhizal colonization and 7–11 nodules per plant. Fluorescent B. diazoefficiens cells were detected in 94% of G. max root nodules. Our findings reveal that, besides its main activity in nutrient transfer, ERM produced by AMF may facilitate bacterial translocation and the simultaneous associations of plants with beneficial fungi and bacteria, representing an important structure, functional to the establishment of symbiotic relationships.
URI: https://doi.org/10.1007/s00572-020-00948-w
http://repositorio.ufla.br/jspui/handle/1/42810
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