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Investigating the impact of the mycorrhizal inoculum on the resident fungal community and on plant growth

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  • Martignoni, Maria M.
  • Garnier, Jimmy
  • Hart, Miranda M.
  • Tyson, Rebecca C.

Abstract

In the last few decades, microbial inoculants have been used as organic fertilizers worldwide. Among the most widely used commercial products are arbuscular mycorrhizal (AM) fungi, as these fungi can associate with a variety of crops. Despite the potential benefits for soil quality and crop yield associated with AM fungal colonization, experiments assessing the persistence of the fungi in the field have yielded inconsistent results. Additionally, it is not yet clear whether or not the introduction of commercial inoculants could lead to changes to the resident fungal community, and eventually to invasion of the commercial products with a possible displacement of resident species. Here we use a partial differential equation model to assess the potential biodiversity risks and productivity benefits deriving from inoculation. We study the impact of AM fungal inoculation on the resident fungal community and on plant growth at a landscape scale. We determine how inoculant persistence and spread are affected by its competition with resident fungal species, by its mutualist quality, and by fungal dispersal. Our findings suggest that the increase in fungal abundance due to inoculation always leads to a short-term increase in host productivity, regardless of inoculant identity. However, the use of strongly competing inoculants constitutes a biodiversity risk, and may result in the invasion of low quality mutualists.

Suggested Citation

  • Martignoni, Maria M. & Garnier, Jimmy & Hart, Miranda M. & Tyson, Rebecca C., 2020. "Investigating the impact of the mycorrhizal inoculum on the resident fungal community and on plant growth," Ecological Modelling, Elsevier, vol. 438(C).
    • Handle: RePEc:eee:ecomod:v:438:y:2020:i:c:s0304380020303896
    DOI: 10.1016/j.ecolmodel.2020.109321
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    References listed on IDEAS

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    1. André L Acosta & Tereza C Giannini & Vera L Imperatriz-Fonseca & Antonio M Saraiva, 2016. "Worldwide Alien Invasion: A Methodological Approach to Forecast the Potential Spread of a Highly Invasive Pollinator," PLOS ONE, Public Library of Science, vol. 11(2), pages 1-25, February.
    2. Isabel Ceballos & Michael Ruiz & Cristhian Fernández & Ricardo Peña & Alia Rodríguez & Ian R Sanders, 2013. "The In Vitro Mass-Produced Model Mycorrhizal Fungus, Rhizophagus irregularis, Significantly Increases Yields of the Globally Important Food Security Crop Cassava," PLOS ONE, Public Library of Science, vol. 8(8), pages 1-10, August.
    3. Samuel Soubeyrand & Leonhard Held & Michael Höhle & Ivan Sache, 2008. "Modelling the spread in space and time of an airborne plant disease," Journal of the Royal Statistical Society Series C, Royal Statistical Society, vol. 57(3), pages 253-272, June.
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    Cited by:

    1. Kun Wang & Yinli Bi & Jiayu Zhang & Shaopeng Ma, 2022. "AMF Inoculum Enhances Crop Yields of Zea mays L. ‘Chenghai No. 618’ and Glycine max L. ‘Zhonghuang No. 17’ without Disturbing Native Fugal Communities in Coal Mine Dump," IJERPH, MDPI, vol. 19(24), pages 1-17, December.

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