A biogeography inquiry to decipher the origin of carob populations (Ceratonia siliqua, Leguminosae)

Alex A., Viruel J., Médail Frédéric, Juin Marianick, Haguenauer Anne, Selva Marjorie, Nieto-Feliner Gonzalo, Bou Dagher Kharrat Magda, La Malfa Stefano, Ouahmane Lahcen, Sanguin Hervé. 2017. A biogeography inquiry to decipher the origin of carob populations (Ceratonia siliqua, Leguminosae). In : XIV MEDECOS and XIII AEET Meeting: Human driven scenarios for evolutionary and ecological changes. Abstract book. ISOMED, AEET. Madrid : AEET, p. 26. MEDECOS International Confrence. 24, Seville, Espagne, 31 Janvier 2017/4 Février 2017.

Note générale : A l'occasion de ce congrès, s'est également déroulé le XIII AEET meeting, 31st January - 4th February 2017, Seville, Espagne

Résumé : Despite its economic importance, the origin and long-term history of carob tree (Ceratonia siliqua L.) are still under debate. Since De Candolle, the wildness of Mediterranean carob populations has been questioned on the basis of paleo-botanical, archeological and philological evidence but, unfortunately, the scarce studies on the ecology and genetic diversity of wild populations have not thrown much light on this topic. The extremely low cold-stress tolerance of carob plants constituted the main argument against a long-term persistence of natural populations throughout Pleistocene in the Mediterranean. Under this scenario, the current carob Mediterranean range would be explained by human dissemination from Western Asia. However, a global phylogeographic study covering the entire distribution of carob is still lacking. We sequenced nuclear and plastid regions from both natural and cultivated populations covering the whole current distribution range of carob to explore its phylogeography based on coalescent methods and divergence time estimations. Here we report the first molecular evidence on the origin of Ceratonia siliqua and we try to set the hypothetical events that shaped the historical biogeography of this tertiary relict lineage.

Auteurs et affiliations

• Alex A., Université Aix-Marseille (FRA)
• Viruel J., Université Aix-Marseille (FRA)
• Médail Frédéric, Université Aix-Marseille (FRA)
• Juin Marianick, Université Aix-Marseille (FRA)
• Haguenauer Anne, Université Aix-Marseille (FRA)
• Selva Marjorie, Université Aix-Marseille (FRA)
• Nieto-Feliner Gonzalo, IATA (ESP)
• Bou Dagher Kharrat Magda, Université Saint-Joseph (LBN)
• La Malfa Stefano, University of Catania (ITA)
• Ouahmane Lahcen, Université Cadi Ayyad (MAR)
• Sanguin Hervé, CIRAD-BIOS-UMR LSTM (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/597356/)

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