Chromosome reciprocal translocations have accompanied subspecies evolution in bananas

Martin Guillaume, Baurens Franc-Christophe, Hervouet Catherine, Salmon Frédéric, Delos Jean-Marie Eric, Labadie Karine, Perdereau Aude, Mournet Pierre, Blois Louis, Dupouy Marion, Carreel Françoise, Ricci Sebastien, Lemainque Arnaud, Yahiaoui Nabila, D'Hont Angélique. 2020. Chromosome reciprocal translocations have accompanied subspecies evolution in bananas. Plant Journal, 104 : 1698-1711.

Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : Chromosome rearrangements and the way that they impact genetic differentiation and speciation have long raised questions from evolutionary biologists. They are also a major concern for breeders because of their bearing on chromosome recombination. Banana is a major crop that derives from inter(sub)specific hybridizations between various once geographically isolated Musa species and subspecies. We sequenced 155 accessions, including banana cultivars and representatives of Musa diversity, and genotyped‐by‐sequencing 1059 individuals from 11 progenies. We precisely characterized six large reciprocal translocations and showed that they emerged in different (sub)species of Musa acuminata, the main contributor to currently cultivated bananas. Most diploid and triploid cultivars analyzed were structurally heterozygous for 1 to 4 M. acuminata translocations, highlighting their complex origin. We showed that all translocations induced a recombination reduction of variable intensity and extent depending on the translocations, involving only the breakpoint regions, a chromosome arm, or an entire chromosome. The translocated chromosomes were found preferentially transmitted in many cases. We explore and discuss the possible mechanisms involved in this preferential transmission and its impact on translocation colonization.

Mots-clés Agrovoc : Musa acuminata, translocation chromosomique, translocation réciproque, évolution, recombinaison

Mots-clés complémentaires : ségrégation chromosomique

Mots-clés libres : Chromosome segregation, Genome evolution, Musa, Reciprocal translocation, Recombination

Classification Agris : F30 - Génétique et amélioration des plantes

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

Auteurs et affiliations

• Martin Guillaume, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-1801-7500 - auteur correspondant
• Baurens Franc-Christophe, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-5219-8771
• Hervouet Catherine, CIRAD-BIOS-UMR AGAP (FRA)
• Salmon Frédéric, CIRAD-BIOS-UMR AGAP (GLP)
• Delos Jean-Marie Eric, CIRAD-BIOS-UMR AGAP (GLP)
• Labadie Karine, Genoscope (FRA)
• Perdereau Aude, Genoscope (FRA)
• Mournet Pierre, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0001-8011-8647
• Blois Louis, Université de Montpellier (FRA)
• Dupouy Marion, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-5308-4557
• Carreel Françoise, CIRAD-BIOS-UMR AGAP (FRA)
• Ricci Sebastien, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0001-7189-9592
• Lemainque Arnaud, Genoscope (FRA)
• Yahiaoui Nabila, CIRAD-BIOS-UMR AGAP (FRA)
• D'Hont Angélique, CIRAD-BIOS-UMR AGAP (FRA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/596991/)

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