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Chapitre D'ouvrage Année : 2024

Functional and practical importance of AMF mixed inoculants for plant development

Hamid Amir
Thomas Crossay
  • Fonction : Auteur

Résumé

Until a recent past, arbuscular mycorrhizal fungi (AMF) were generally used as single species inoculants carefully selected to enhance plant growth. However, in ecological perspective, it is expected that a mixture of different AMF species would be more efficient to occupy the ecological niches of the symbiosis and would adapt better to environmental fluctuations. A limited number of studies have reported complementary effects of different AMF taxa on plant development. Experiments were performed in different conditions. In most cases, combinations of AMF showed better results than single species. Particularly clear results were obtained in ultramafic soils characterized by multiple stress factors: low level of main mineral elements, high concentrations of potentially toxic metals (Ni, Co, Cr, Mn), and critically low Ca/Mg ratio. These studies reported synergistic effects of mixed isolates belonging to different families. The most performant mix showed quantities of P and K absorbed per plant more than 10 times higher than non-inoculated plants and more than two times higher than the most performant AMF isolate. Inversely, the translocation factors for potentially toxic metals (particularly Ni and Co) were reduced three to ten times. Mathematical modelization of the effects of 12 AMF inoculants, including six mixes on plant growth, revealed that the predicted value of the performance based on the properties of the different AMF was very high (R2 = 0.90; p < 0.00001), indicating that the improvement of plant biomass was nearly totally explained as a resultant of the complementary effects of the 5 isolates. Field experiments in natural conditions and commercial trials confirmed the greenhouse results obtained in sterilized soils and revealed large positive effects on plant development of selected AMF mixes. For such success, it is suggested that the isolates used for the mixed inoculants must belong to different families, and must be selected for their synergistic effects on plant development.
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Dates et versions

hal-04451835 , version 1 (12-02-2024)

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  • HAL Id : hal-04451835 , version 1

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Hamid Amir, Thomas Crossay. Functional and practical importance of AMF mixed inoculants for plant development. M. Parihar. Advances in Arbuscular Mycorrhizal Fungal Technology for Sustainable Agriculture I: Inoculum Production and Application Perspective., Springer, In press. ⟨hal-04451835⟩

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