Abstract
The symbiosis of Leguminosae with arbuscular mycorrhizal fungi (AMF) and N2-fixing nodulating bacteria (NFNB) can occur simultaneously, forming a tripartite symbiosis. In particular, AMF can colonize root nodules, although this interaction is not yet well elucidated, especially with regard to nodule activity and to the influence of external factors, such as biostimulants. In this study, we hypothesized that the application of the flavonoid formononetin, used to stimulate root colonization by native AMF, increases the AMF colonization of soybean (Glycine max) root nodules, especially under low availability of phosphorus (P). To test this hypothesis, we performed a field experiment in randomized blocks in a 4 × 3 factorial design, with 4 treatments of formononetin (0, 0.46, 0.92 and 1.84 g per kg seed) and 3 of P (0, 60 and 120 kg ha−1) with 5 replicates. Nodules and roots were collected during the R2 stage (full flowering) and evaluated with respect to AMF colonization. Formononetin stimulated mycorrhizal fungi colonization of active nodules, especially when no P was applied, as also observed for AMF root colonization; however, it had no effect with 60 and 120 kg P ha−1. Thus, the application of formononetin increases surface AMF colonization of active nodules and roots, but its effect disappears with an increase in P and the inactivity of the nodule.
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Acknowledgments
We acknowledge the National Council for Scientific and Technological Development (Conselho Nacional de Desenvolvimento Científico e Tecnológico) and the Ministry of Science and Technology (Ministério de Ciência e Tecnologia) (MCT/CNPq/Ct-AGRO N° 69/2009) for financial support and for a scientific initiation fellowship to Jacqueline Savana da Silva and Teotonio Soares de Carvalho, a doctoral fellowship to Jessé Valentim dos Santos, and a research productivity fellowship to Fatima Maria de Souza Moreira. We also acknowledge the Coordination for the Improvement of Higher Education Personnel (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Capes) for a doctoral fellowship to Paula Rose de Almeida Ribeiro.
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Savana da Silva, J., Soares de Carvalho, T., Valentim dos Santos, J. et al. Formononetin stimulates mycorrhizal fungi colonization on the surface of active root nodules in soybean. Symbiosis 71, 27–34 (2017). https://doi.org/10.1007/s13199-016-0408-9
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DOI: https://doi.org/10.1007/s13199-016-0408-9