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Diesel fuel differentially affects hyphal healing in Gigaspora sp. and Rhizophagus irregularis

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Abstract

Hydrocarbon pollution is an increasing problem affecting soil ecosystems. However, some microorganisms can cope with these pollutants and even facilitate plant establishment and thus phytoremediation. Within soil, arbuscular mycorrhizal fungi (AMF) have developed several strategies to survive and flourish under adverse conditions. Among these is the hyphal healing mechanism (HHM), a process allowing hyphae to re-establish integrity after physical injury. This mechanism differs among species and genera of AMF. However, whether and to what extent hydrocarbon pollution impacts the HHM is unknown. Here, the HHM was monitored in vitro on two AMF strains, Rhizophagus irregularis MUCL 41833 and Gigaspora sp. MUCL 52331, under increasing concentrations of diesel (1, 2, and 5% v:v). The addition of diesel slowed-down the HHM in both fungi. On Gigaspora sp., this effect was limited and most hyphae were able to heal after injury. Conversely, all steps of healing were severely impaired in R. irregularis. That fungus reconnected the injured hyphae at a much lower frequency than the Gigaspora sp., instead investing its energy to link neighboring hyphae or roots, or developing new branches from uninjured hyphae.

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This research was sponsored by the CIUF–CUD (currently ARES, Académie de Recherche et d’enseignement Supérieur Wallonie-Bruxelles, Commission de la Coopération pour le Dévelopment CIUF) through the PIC Project entitled “Reinforcement of the fungal expertise in Ecuador via case studies of fungal plants interactions in selected ecosystems and the development of biotechnology-oriented fungal resource.” Additional support was given to Mónica Garcés Ruiz by the Pontificia Universidad Católica del Ecuador (PUCE) projects.

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Correspondence to Stéphane Declerck.

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Garcés-Ruiz, M., Calonne-Salmon, M., Bremhorst, V. et al. Diesel fuel differentially affects hyphal healing in Gigaspora sp. and Rhizophagus irregularis. Mycorrhiza 31, 413–421 (2021). https://doi.org/10.1007/s00572-021-01026-5

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  • DOI: https://doi.org/10.1007/s00572-021-01026-5

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