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Is a mixture of arbuscular mycorrhizal fungi better for plant growth than single-species inoculants?

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Abstract

Inoculation of arbuscular mycorrhizal fungi (AMF) as plant growth promoters has mostly been conducted using single-species inoculum. In this study, we investigated whether co-inoculation of different native AMF species induced an improvement of plant growth in an ultramafic soil. We analyzed the effects of six species of AMF from a New Caledonian ultramafic soil on plant growth and nutrition, using mono-inoculations and mixtures comprising different numbers of AMF species, in a greenhouse experiment. The endemic Metrosideros laurifolia was used as a host plant. Our results suggest that, when the plant faced multiple abiotic stress factors (nutrient deficiencies and high concentrations of different heavy metals), co-inoculation of AMF belonging to different families was more efficient than mono-inoculation in improving biomass, mineral nutrition, Ca/Mg ratio, and tolerance to heavy metals of plants in ultramafic soil. This performance suggested functional complementarity between distantly related AMF. Our findings will have important implications for restoration ecology and mycorrhizal biotechnology applied to ultramafic soils.

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Funding

This study received financial support from CNRT “Nickel et son Environnement.”

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Contributions

T.C. designed the research, provided AMF cultures, conducted the molecular and greenhouse experiment, analyzed data and wrote the manuscript; C.M. conducted the molecular analysis; D.R. contributed to the research supervision and wrote the manuscript; S.G. contributed to the statistical analysis; V.M. contributed to the greenhouse experiment; G.D. conducted statistical analysis; Y.C. contributed to the research supervision; H.A. supervised and designed the research, provided the funding, and wrote the manuscript.

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Correspondence to Thomas Crossay or Hamid Amir.

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Crossay, T., Majorel, C., Redecker, D. et al. Is a mixture of arbuscular mycorrhizal fungi better for plant growth than single-species inoculants?. Mycorrhiza 29, 325–339 (2019). https://doi.org/10.1007/s00572-019-00898-y

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  • DOI: https://doi.org/10.1007/s00572-019-00898-y

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