Repeated evolution of fungal cultivar specificity in independently evolved ant-plant-fungus symbioses

Blatrix Rumsaïs, Debaud Sarah, Salas-Lopez Alex, Born Céline, Benoit Laure, McKey Doyle B., Attéké Christiane, Djiéto-Lordon Champlain. 2013. Repeated evolution of fungal cultivar specificity in independently evolved ant-plant-fungus symbioses. PloS One, 8 (7):e68101, 9 p.

Quartile : Outlier, Sujet : MULTIDISCIPLINARY SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie; Staps

Résumé : Some tropical plant species possess hollow structures (domatia) occupied by ants that protect the plant and in some cases also provide it with nutrients. Most plant-ants tend patches of chaetothyrialean fungi within domatia. In a few systems it has been shown that the ants manure the fungal patches and use them as a food source, indicating agricultural practices. However, the identity of these fungi has been investigated only in a few samples. To examine the specificity and constancy of ant-plant-fungus interactions we characterised the content of fungal patches in an extensive sampling of three ant-plant symbioses ( Petalomyrmex phylax / Leonardoxa africana subsp. africana , Aphomomyrmex afer / Leonardoxa africana subsp. letouzeyi and Tetraponera aethiops / Barteria fistulosa ) by sequencing the Internal Transcribed Spacers of ribosomal DNA. For each system the content of fungal patches was constant over individuals and populations. Each symbiosis was associated with a specific, dominant, primary fungal taxon, and to a lesser extent, with one or two specific secondary taxa, all of the order Chaetothyriales. A single fungal patch sometimes contained both a primary and a secondary taxon. In one system, two founding queens were found with the primary fungal taxon only, one that was shown in a previous study to be consumed preferentially. Because the different ant-plant symbioses studied have evolved independently, the high specificity and constancy we observed in the composition of the fungal patches have evolved repeatedly. Specificity and constancy also characterize other cases of agriculture by insects.

Classification Agris : F40 - Écologie végétale
F60 - Physiologie et biochimie végétale
L20 - Écologie animale

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Blatrix Rumsaïs, Centre national de la recherche scientifique (FRA)
• Debaud Sarah, Centre national de la recherche scientifique (FRA)
• Salas-Lopez Alex, Centre national de la recherche scientifique (FRA)
• Born Céline, Centre national de la recherche scientifique (FRA)
• Benoit Laure, CIRAD-BIOS-UMR CEFE (FRA)
• McKey Doyle B., CEFE (FRA)
• Attéké Christiane, Université des sciences et techniques de Masuku (GAB)
• Djiéto-Lordon Champlain, Université de Yaoundé (CMR)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/570137/)

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