Recombination and large structural variations shape interspecific edible bananas genomes

Baurens Franc-Christophe, Martin Guillaume, Hervouet Catherine, Salmon Frédéric, Yohomé David, Ricci Sebastien, Rouard Mathieu, Habas Rémy, Lemainque Arnaud, Yahiaoui Nabila, D'Hont Angélique. 2019. Recombination and large structural variations shape interspecific edible bananas genomes. Molecular Biology and Evolution, 36 (1) : 97-111.

https://doi.org/10.1093/molbev/msy199

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Url - autres données associées : https://www.southgreen.fr/content/recombination-and-large-structural-variations-shape-interspecific-edible-bananas-genomes

Quartile : Outlier, Sujet : GENETICS & HEREDITY / Quartile : Outlier, Sujet : BIOCHEMISTRY & MOLECULAR BIOLOGY / Quartile : Outlier, Sujet : EVOLUTIONARY BIOLOGY

Liste HCERES des revues (en SHS) : oui

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

Résumé : Admixture and polyploidization are major recognized eukaryotic genome evolutionary processes. Their impacts on genome dynamics vary among systems and are still partially deciphered. Many banana cultivars are triploid (sometimes diploid) interspecific hybrids between Musa acuminata (A genome) and M. balbisiana (B genome). They have no or very low fertility, are vegetatively propagated and have been classified as 'AB', 'AAB' or 'ABB' based on morphological characters. We used NGS sequence data to characterize the A vs. B chromosome composition of nine diploid and triploid interspecific cultivars, to compare the chromosome structures of A and B genomes and analyze A/B chromosome segregations in a polyploid context. We showed that interspecific recombination occurred frequently between A and B chromosomes. We identified two large structural variations between A and B genomes, a reciprocal translocation and an inversion that locally affected recombination and led to segregation distortion and aneuploidy in a triploid progeny. Interspecific recombination and large structural variations explained the mosaic genomes observed in edible bananas. The unprecedented resolution in deciphering their genome structure allowed us to start revisiting the origins of banana cultivars and provided new information to gain insight into the impact of interspecificity on genome evolution. It will also facilitate much more effective assessment of breeding strategies.

Mots-clés Agrovoc : banane, génome, hybride

Mots-clés libres : Banana, Chromosome, Polyploidy, Interspecific hybrids, Genome evolution

Classification Agris : F30 - Génétique et amélioration des plantes

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

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