Meiotic behaviors of allotetraploid citrus drive the interspecific recombination landscape, the genetic structures, and traits inheritance in tetrazyg progenies aiming to select new rootstocks

Calvez Lény, Dereeper Alexis, Perdereau Aude, Mournet Pierre, Miranda Maëva, Bruyère Saturnin, Hufnagel Maciel Bárbara, Froelicher Yann, Lemainque Arnaud, Morillon Raphaël, Ollitrault Patrick. 2023. Meiotic behaviors of allotetraploid citrus drive the interspecific recombination landscape, the genetic structures, and traits inheritance in tetrazyg progenies aiming to select new rootstocks. Plants, 12, n.spéc. Advances in Breeding, Genetics, and Genomics of Citrus:1630, 26 p.

Résumé : Sexual breeding at the tetraploid level is a promising strategy for rootstock breeding in citrus. Due to the interspecific origin of most of the conventional diploid citrus rootstocks that produced the tetraploid germplasm, the optimization of this strategy requires better knowledge of the meiotic behavior of the tetraploid parents. This work used Genotyping By Sequencing (GBS) data from 103 tetraploid hybrids to study the meiotic behavior and generate a high-density recombination landscape for their tetraploid intergenic Swingle citrumelo and interspecific Volkamer lemon progenitors. A genetic association study was performed with root architecture traits. For citrumelo, high preferential chromosome pairing was revealed and led to an intermediate inheritance with a disomic tendency. Meiosis in Volkamer lemon was more complex than that of citrumelo, with mixed segregation patterns from disomy to tetrasomy. The preferential pairing resulted in low interspecific recombination levels and high interspecific heterozygosity transmission by the diploid gametes. This meiotic behavior affected the efficiency of Quantitative Trait Loci (QTL) detection. Nevertheless, it enabled a high transmission of disease and pest resistance candidate genes from P. trifoliata that are heterozygous in the citrumelo progenitor. The tetrazyg strategy, using doubled diploids of interspecific origin as parents, appears to be efficient in transferring the dominant traits selected at the parental level to the tetraploid progenies.

Mots-clés Agrovoc : porte greffe, tétraploïdie, Citrus, Citrus medica, Poncirus trifoliata, locus des caractères quantitatifs, polyploïdie, amélioration génétique, amélioration des plantes, méiose, diploïdie, Citrus reticulata, disomie, phytogénétique

Mots-clés libres : Polyploidy, Rootstock breeding, Meiosis, Preferential pairing, Recombination landscape, Quantitative traits loci, Citrus, Poncirus trifoliata, C. medica, Inter-specificit

Classification Agris : F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Agences de financement européennes : European Regional Development Fund

Agences de financement hors UE : Région Guadeloupe, France Génomique

Projets sur financement : (GLP) Caractérisation et Valorisation de la Biodiversité Végétale Tropicale d’Intérêt Agronomique, (FRA) Dynamo

Auteurs et affiliations

• Calvez Lény, Université de Montpellier (FRA)
• Dereeper Alexis, Université de Montpellier (FRA)
• Perdereau Aude, Genoscope (FRA)
• Mournet Pierre, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0001-8011-8647
• Miranda Maëva, CIRAD-BIOS-UMR AGAP (FRA)
• Bruyère Saturnin, CIRAD-BIOS-UMR AGAP (GLP)
• Hufnagel Maciel Bárbara, CIRAD-BIOS-UMR AGAP (GLP) ORCID: 0000-0002-3515-2122
• Froelicher Yann, CIRAD-BIOS-UMR AGAP (FRA)
• Lemainque Arnaud, Genoscope (FRA)
• Morillon Raphaël, CIRAD-BIOS-UMR AGAP (FRA)
• Ollitrault Patrick, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-9456-5517 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/604407/)

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