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Bacterial farming by the fungus <i>Morchella crassipes</i>
Auteur(s)
Pion, Martin
Jorge E. Spangenberg
Flury, Coralie
Chatelain, Auriel
Maison d'édition
The Royal Society of London
In
Proceedings of the Royal Society B: Biological Sciences
Vol.
280
De la page
2013
A la page
2242
Résumé
The interactions between bacteria and fungi, the main actors of the soil microbiome, remain poorly studied. Here, we show that the saprotrophic and ectomycorrhizal soil fungus <i>Morchella crassipes</i> acts as a bacterial farmer of <i>Pseudomonas putida</i>, which serves as a model soil bacterium. Farming by <i>M. crassipes</i> consists of bacterial dispersal, bacterial rearing with fungal exudates, as well as harvesting and translocation of bacterial carbon. The different phases were confirmed experimentally using cell counting and <sup>13</sup>C probing. Common criteria met by other non-human farming systems are also valid for <i>M. crassipes</i> farming, including habitual planting, cultivation and harvesting. Specific traits include delocalization of food production and consumption and separation of roles in the colony (source versus sink areas), which are also found in human agriculture. Our study evidences a hitherto unknown mutualistic association in which bacteria gain through dispersal and rearing, while the fungus gains through the harvesting of an additional carbon source and increased stress resistance of the mycelium. This type of interaction between fungi and bacteria may play a key role in soils.
Identifiants
Type de publication
journal article
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