Inheritance pattern of tetraploids pummelo, mandarin, and their interspecific hybrid sour orange is highly influenced by their phylogenomic structure

Aleza Pablo, Garavello Miguel Fernando, Rouiss Houssem, Benedict Ana Cristina, Garcia-Lor Andrés, Hernandez Maria, Navarro Luis, Ollitrault Patrick. 2023. Inheritance pattern of tetraploids pummelo, mandarin, and their interspecific hybrid sour orange is highly influenced by their phylogenomic structure. Frontiers in Plant Science, 14:1327872, 15 p.

Résumé : Citrus polyploidy is associated with a wide range of morphological, genetic, and physiological changes that are often advantageous for breeding. Citrus triploid hybrids are very interesting as new seedless varieties. However, tetraploid rootstocks promote adaptation to different abiotic stresses and promote resilience. Triploid and tetraploid hybrids can be obtained through sexual hybridizations using tetraploid parents (2x × 4x, 4x × 2x, or 4x × 4x), but more knowledge is needed about the inheritance pattern of tetraploid parents to optimize the efficiency of triploid varieties and tetraploid rootstock breeding strategies. In this work, we have analyzed the inheritance pattern of three tetraploid genotypes: 'Chandler' pummelo (Citrus maxima) and 'Cleopatra' mandarin (Citrus reticulata), which represent two clear examples of autotetraploid plants constituted by the genome of a single species, and the 'Sevillano' sour orange, which is an allotetraploid interspecific hybrid between C. maxima and C. reticulata. Polymorphic simple sequence repeat (SSR) and single-nucleotide polymorphism (SNP) markers were used to estimate parental heterozygosity restitution, and allele frequencies for centromeric loci were used to calculate the preferential pairing rate related to the proportion of disomic and tetrasomic segregation. The tetraploid pummelo and mandarin displayed tetrasomic segregation. Sour orange evidenced a clear intermediate inheritance for five of the nine chromosomes (1, 2, 5, 7, and 8), a slight tendency toward tetrasomic inheritance on chromosome 3, and intermediate inheritance with a tendency toward disomy for chromosomes 4, 6, and 9. These results indicate that the interspecific versus intraspecific phylogenomic origin affects preferential pairing and, therefore, the inheritance patterns. Despite its high level of heterozygosity, the important preferential chromosome pairing observed in sour orange results in a limited diversity of the genotypic variability of its diploid gametes, and consequently, a large part of the genetic value of the original diploid sour orange is transferred to the tetraploid progenies.

Mots-clés Agrovoc : Citrus, Citrus reticulata, tétraploïdie, Citrus maxima, polyploïdie, marqueur génétique, polymorphisme génétique, hybridation interspécifique, stress abiotique, porte greffe, hérédité, génotype, triploïdie, méiose, mandarine

Mots-clés libres : Citrus, Polyploid, Meiosis, Citrus reticulata, Citrus maxima

Classification Agris : F30 - Génétique et amélioration des plantes

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

Agences de financement européennes : European Commission, European Regional Development Fund

Agences de financement hors UE : Ministerio de Ciencia e Innovación, Instituto Valenciano de Investigaciones Agrarias

Auteurs et affiliations

• Aleza Pablo, IVIA (ESP) - auteur correspondant
• Garavello Miguel Fernando, IVIA (ESP)
• Rouiss Houssem, IVIA (ESP)
• Benedict Ana Cristina, IVIA (ESP)
• Garcia-Lor Andrés, IVIA (ESP)
• Hernandez Maria, IVIA (ESP)
• Navarro Luis, IVIA (ESP)
• Ollitrault Patrick, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-9456-5517 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/607802/)

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