FDR and SRD are meiotic mechanisms involved in unreduced pollen gamete formation in a diploid hybrid between clementine and sweet orange

Rouiss Houssem, Cuenca José, Navarro Luis, Ollitrault Patrick, Aleza Pablo. 2016. FDR and SRD are meiotic mechanisms involved in unreduced pollen gamete formation in a diploid hybrid between clementine and sweet orange. In : Abstract book Sustainable citriculture: the role of applied knowledge. Mattos Dirceu (ed.), Fermino Carlos Eduardo (ed.), Moreira Novelli Valdenice (ed.), Alves de Azevedo Fernando (ed.), Della Coletta Filho Helvécio (ed.), Vicente Contador Zaccheo Paulo (ed.). IAC, IAPAR. Londrina : IAPAR, Résumé, 100. ISBN 978-85-88184-55-8 International Citrus Congress, Foz do Iguaçu, Brésil, 18 Septembre 2016/23 Septembre 2016.

Résumé : A diploid hybrid between Citrus clementina and C. sinensis (CDO) was used as male parent in 4x x 2x sexual hybridizations with tetraploid Fina clementine and Moncada mandarin as female parents to produce triploid hybrids. Unexpectedly, in addition to some triploids, a total of seventy-two tetraploid plants were obtained, 62 plants from Fina x CSO and ten from Moncada x CSO. SSR and SNP markers analysis releaved that recovered tetraploid plants were hybrids arising from unreduced pollen gametes. A maximum-likelihood methodology based on parental heterozygosity restitution (PHR) of markers close to the centromeres was used to identify the mechanism underlying 2n pollen gamete formation. Thirty five tetraploid hybrids were identified to arise from FDR (56%) and 18 from SDR (29%) mechanisms. Inconclusive data were obtained for nine tetraploid hybrids. The pattern of variation of PHR values of ten SSR and twi SNP markers located along linkage groups 1 and 2 confirmed our results at population level. To our knowledge this is the first report in citrus of progenies of tetraploid hybrids recovered from 2n pollen gametes and the first description of coexistence of two meiotic mechanisms (SDR and FDR) producing unreduced pollen gametes. (Texte intégral)

Classification Agris : F30 - Génétique et amélioration des plantes
F63 - Physiologie végétale : reproduction
F60 - Physiologie et biochimie végétales

Auteurs et affiliations

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

Source : Cirad-Agritrop (https://agritrop.cirad.fr/583479/)

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