What are the ecological drivers of symbiotic microbiome assemblages? The case of an antic affair between an iconic Mediterranean fruit tree and its symbiotic microbiome

Mahé Frédéric, Tisseyre Pierre, Tournier Estelle, Khassali Hamza, Le Roux Christine, Geoffroy Alexandre, Mirleau Pascal, Miché L., Arrighi Jean-François, Duponnois Robin, Hafidi Mohamed, Ouhammou A., Vincentelli Bruno, Anziani Carole, Hugot Laetitia, Diadema Katia, Feliner Gonzalo Nieto, Viruel Juan, Médail Frédéric, Bou Dagher Kharrat Magda, La Malfa Stefano, Prin Yves, Ouahmane Lahcen, Baumel Alex, Sanguin Hervé. 2018. What are the ecological drivers of symbiotic microbiome assemblages? The case of an antic affair between an iconic Mediterranean fruit tree and its symbiotic microbiome. In : Booklet of Sfécologie 2018. Société Française d'Écologie et d'Évolution. Rennes : Société Française d'Écologie et d'Évolution, Résumé, 300-301. International Conference on Ecological Sciences : Sfécologie 2018, Rennes, France, 22 Octobre 2018/25 Octobre 2018.

Résumé : The root symbiotic microbiome, notably arbuscular mycorrizal (AM) fungi, is a key factor of plant ecology and agro-ecosystem functioning, but the relative contribution of multiple ecological factors driving their diversity and assemblage are poorly assessed. Moreover, few studies have approached this question with a wide geographical perspective, which is important when dealing with domesticated fruit trees characterised by diverse cultivated, feral or wild populations, and consequently subjected to a wide range of environmental constraints and selection pressures. In the framework of the international project DYNAMIC (Deciphering sYmbiotic Networks in cArob-based MedIterranean agro-eCosystems), a metabarcoding approach was developed to assess the specificity of tree-symbiotic microbiome associations and to characterise the relative contribution of main ecological drivers of symbiotic microbiome associated with the carob tree in the Mediterranean basin. The carob tree (Ceratonia siliqua) is a multi-use tree of high socio-economical added value with a major place in the traditional rural landscapes of Mediterranean regions. It belongs to the highly diverse family of legumes (Fabaceae) but does not nodulate. However, the carob tree is highly dependent of arbuscular mycorrhizal (AM) symbiosis, and bacterial endophytes were hypothesized as a second major symbiotic partner. Domestication in the Middle-East around 6,000-4,000 BC may have caused extensive genetic and physiological modifications in carob, conducing to potential changes/adaptations of its associated symbiotic microbiome. These impacts have been investigated for domesticated cereals but rarely for trees. The results provide new insights into the characterization of a Mediterranean core and accessory ”SymbiOme” of the carob tree, highlighting geographical patterns, as well as the contribution of host genetic diversity, habitat and edaphic parameters. The better understanding of ecological rules controlling the specificity of interaction in tree symbiotic associations opens up promising perspectives for the development of more efficient strategies in conservation and agroecology based on plant microbiome symbiosis.

Auteurs et affiliations

• Mahé Frédéric, CIRAD-BIOS-UMR LSTM (FRA) ORCID: 0000-0002-2808-0984
• Tisseyre Pierre, IRD (FRA)
• Tournier Estelle, CIRAD-BIOS-UMR LSTM (FRA)
• Khassali Hamza, CIRAD-BIOS-UMR LSTM (FRA)
• Le Roux Christine, CIRAD-BIOS-UMR LSTM (FRA) ORCID: 0000-0003-0668-3589
• Geoffroy Alexandre, CIRAD-BIOS-UMR LSTM (FRA)
• Mirleau Pascal, IMBE (FRA)
• Miché L., IMBE (FRA)
• Arrighi Jean-François, IRD (FRA)
• Duponnois Robin, IRD (FRA)
• Hafidi Mohamed, Université Cadi Ayyad (MAR)
• Ouhammou A., Université Cadi Ayyad (MAR)
• Vincentelli Bruno, Corsican Environmental Office (FRA)
• Anziani Carole, Corsican Environmental Office (FRA)
• Hugot Laetitia, National Botanical Conservatory of Corsica (FRA)
• Diadema Katia, Conservatoire Botanique National Méditerranéen de Porquerolles (FRA)
• Feliner Gonzalo Nieto, Real Jardin Botanico (ESP)
• Viruel Juan, Royal Botanic Garden (GBR)
• Médail Frédéric, IMBE (FRA)
• Bou Dagher Kharrat Magda, Université Saint-Joseph (LBN)
• La Malfa Stefano, University of Catania (ITA)
• Prin Yves, CIRAD-BIOS-UMR LSTM (FRA) ORCID: 0000-0002-3706-0045
• Ouahmane Lahcen, CIRAD-BIOS-UMR LSTM (FRA)
• Baumel Alex, IMBE (FRA)
• Sanguin Hervé, CIRAD-BIOS-UMR LSTM (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/589645/)

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