Genome ancestry mosaics reveal multiple and cryptic contributors to cultivated banana

Martin Guillaume, Cardi Céline, Sarah Gautier, Ricci Sebastien, Jenny Christophe, Fondi Emmanuel, Perrier Xavier, Glaszmann Jean-Christophe, D'Hont Angélique, Yahiaoui Nabila. 2020. Genome ancestry mosaics reveal multiple and cryptic contributors to cultivated banana. Plant Journal, 102 (5) : 1008-1025.

Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : Hybridizations between closely related species commonly occur in the domestication process of many crops. Banana cultivars are derived from such hybridizations between species and subspecies of the Musa genus that have diverged in various tropical Southeast Asian regions and archipelagos. Among the diploid and triploid hybrids generated, those with seedless parthenocarpic fruits were selected by humans and thereafter dispersed through vegetative propagation. Musa acuminata subspecies contribute to most of these cultivars. We analyzed sequence data from 14 M. acuminata wild accessions and 10 M. acuminata‐based cultivars, including diploids and one triploid, to characterize the ancestral origins along their chromosomes. We used multivariate analysis and single nucleotide polymorphism clustering and identified five ancestral groups as contributors to these cultivars. Four of these corresponded to known M. acuminata subspecies. A fifth group, found only in cultivars, was defined based on the 'Pisang Madu' cultivar and represented two uncharacterized genetic pools. Diverse ancestral contributions along cultivar chromosomes were found, resulting in mosaics with at least three and up to five ancestries. The commercially important triploid Cavendish banana cultivar had contributions from at least one of the uncharacterized genetic pools and three known M. acuminata subspecies. Our results highlighted that cultivated banana origins are more complex than expected – involving multiple hybridization steps – and also that major wild banana ancestors have yet to be identified. This study revealed the extent to which admixture has framed the evolution and domestication of a crop plant.

Mots-clés Agrovoc : Musa acuminata, génome, variation génétique, hybridation intergénérique, variété, domestication des plantes

Mots-clés géographiques Agrovoc : Asie du Sud-Est, Thaïlande, Myanmar, Bornéo, Malaisie, Martinique, Indonésie, Philippines, Singapour, Papouasie-Nouvelle-Guinée, Comores, France

Mots-clés complémentaires : brassage génétique

Mots-clés libres : Admixture, Genome ancestry, Hybridization, Musa acuminata, Diversity

Classification Agris : F30 - Génétique et amélioration des plantes
F70 - Taxonomie végétale et phytogéographie

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Auteurs et affiliations

• Martin Guillaume, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-1801-7500 - auteur correspondant
• Cardi Céline, CIRAD-BIOS-UMR AGAP (FRA)
• Sarah Gautier, INRA (FRA)
• Ricci Sebastien, CIRAD-BIOS-UMR AGAP (GLP) ORCID: 0000-0001-7189-9592
• Jenny Christophe, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0001-6165-6888
• Fondi Emmanuel, CARBAP (CMR)
• Perrier Xavier, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-0092-003X
• Glaszmann Jean-Christophe, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0001-9918-875X
• D'Hont Angélique, CIRAD-BIOS-UMR AGAP (FRA)
• Yahiaoui Nabila, CIRAD-BIOS-UMR AGAP (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/595226/)

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