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Inheritance in doubled-diploid clementine and comparative study with SDR unreduced gametes of diploid clementine

Aleza Pablo, Cuenca José, Juarez José, Navarro Luis, Ollitrault Patrick. 2016. Inheritance in doubled-diploid clementine and comparative study with SDR unreduced gametes of diploid clementine. Plant Cell Reports, 35 (8) : pp. 1573-1586.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Quartile : Q1, Sujet : PLANT SCIENCES

Abstract : Triploid breeding is developed worldwide to create new seedless cultivars. Citrus triploid hybrids can be recovered from 2x × 2x sexual hybridizations as a consequence of the formation of unreduced gametes (2n), or from 4x × 2x interploid hybridizations in which tetraploid parents used are most often doubled-diploid (DD). Here we have analyzed the inheritance in doubled-diploid clementine and compared the genetic structures of gametes of DD clementine with SDR unreduced gametes of diploid clementine. Parental heterozygosity restitution (PHR) with DD parents depends on the rate of preferential chromosome pairing and thus the proportion of disomic versus tetrasomic segregations. Doubled-diploid clementine largely exhibited tetrasomic segregation. However, three linkage groups had intermediate segregation and one had a tendency for disomy. Significant doubled reduction rates (DR) rates were observed in six of the nine LGs. Differences of PHR between 2n SDR and 2x DD gametes were highest in the centromeric region and progressively decreased toward the distal regions where they were not significant. Over all markers, PHR was lower (two-thirds) in SDR 2n gametes than in DD-derived diploid gametes. The two strategies appear complementary in terms of genotypic variability. Interploid 4x × 2x hybridization is potentially more efficient for developing new cultivars that are phenotypically closer to the diploid parent of the DD than sexual hybridization through SDR 2n gametes. Conversely, 2x × 2x triploidisation has the potential to produce novel products with characteristics for market segmentation strategies. (Résumé d'auteur)

Mots-clés Agrovoc : Citrus, Citrus reticulata, Citrus sinensis, Hybridation interspécifique, Triploïdie, Diploïdie, Héritabilité, Marqueur génétique, Méiose, Gamète, Génotype, Ségrégation, Génétique des populations, Variation génétique, Amélioration des plantes

Mots-clés complémentaires : SSR

Mots-clés libres : Citrus, Triploid, SSR and SNP markers, Second division restitution, Tetrasomic, Disomic

Classification Agris : F30 - Plant genetics and breeding
U30 - Research methods
F60 - Plant physiology and biochemistry
F63 - Plant physiology - Reproduction
U10 - Computer science, mathematics and statistics

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

  • Aleza Pablo, IVIA (ESP)
  • Cuenca José, IVIA (ESP)
  • Juarez José, IVIA (ESP)
  • Navarro Luis, IVIA (ESP)
  • Ollitrault Patrick, CIRAD-BIOS-UMR AGAP (GLP) ORCID: 0000-0002-9456-5517

Source : Cirad-Agritrop (https://agritrop.cirad.fr/580487/)

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