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Benefits of dual inoculation with arbuscular mycorrhizal fungi and rhizobia on Phaseolus vulgaris planted in a low-fertility tropical soil

Razakatiana A.T.E., Trap J., Baohanta R.H., Raherimandimby M., Le Roux C., Duponnois R., Ramanankierana H., Becquer T.. 2020. Pedobiologia, 83 : 4 p..

DOI: 10.1016/j.pedobi.2020.150685

The growth response of Phaseolus vulgaris to dual inoculation with arbuscular mycorrhizal (AM) fungi and rhizobia was studied in a low-fertility tropical soil in Madagascar. Two isolates of AM fungi identified as Acaulospora sp. and Glomus sp., respectively, along with a cocktail of ten Rhizobium spp. strains were used to conduct a greenhouse experiment in a fully randomized block design with two factors. The Phaseolus vulgaris seedlings received one of the following inoculation treatments: no inoculation, separate inoculation with each of the three microbial symbionts (the two AM fungal isolates and the rhizobia), and co-inoculation with each of the two AM fungal isolates and the mix of rhizobium strains. The results showed an additive effect of co-infection by AM fungi and rhizobia on plant growth and on the total N content of the plants, along with a synergistic effect on the total P content, the number of nodules and the mycorrhizal rate of the plants. Dual symbiosis with native strains contributes to the success of legumes, especially in harsh environments and low-fertility tropical soils.

Mots-clés : phaseolus vulgaris; arbuscular mycorrhiza [en]; rhizobium; sol tropical; fertilité du sol; acaulospora; glomus; inoculation des racines; madagascar

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