Intermediate inheritance with disomic tendency in tetraploid intergeneric Citrus × Poncirus hybrids enhances the efficiency of citrus rootstock breeding

Calvez Lény, Dereeper Alexis, Mournet Pierre, Froelicher Yann, Bruyère Saturnin, Morillon Raphaël, Ollitrault Patrick. 2020. Intermediate inheritance with disomic tendency in tetraploid intergeneric Citrus × Poncirus hybrids enhances the efficiency of citrus rootstock breeding. Agronomy (Basel), 10 (12):1961, 24 p.

Quartile : Q1, Sujet : AGRONOMY / Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : Rootstocks are crucial for the sustainability of the citrus industry worldwide. Diploid intergeneric Citrus × Poncirus hybrids have contributed considerably to citrus rootstock improvement and their tetraploid (doubled-diploid) forms are important resources for the creation of a new generation of tetraploid rootstocks. To optimize the efficiency of tetraploid rootstock breeding strategies, more knowledge is required on inheritance in the allotetraploid genitors. A set of 159 new SNP markers that fully distinguish Poncirus trifoliata (L.) Raf. from Citrus species was developed from polymorphisms mined in GBS data and used to establish a genetic map of tetraploid citrumelo (C. × paradisi Macfad. × P. trifoliata) and to analyze the meiotic behavior of tetraploid citrumelo and citrandarin (C. reticulata Blanco × P. trifoliata). The tetraploid citrumelo genetic map was highly syntenic and collinear with the clementine reference genome. The apparent intergeneric recombination rate was strongly limited by high preferential chromosome pairing, resulting in intermediate inheritance with disomic tendency. Such inheritance, also observed in tetraploid citrandarin, results in the transmission by the diploid gametes of a high rate of intergeneric heterozygosity. It is therefore expected that a large part of the genetic value selected in the original diploid intergeneric rootstock is transmitted to the tetraploid sexual progenies.

Mots-clés Agrovoc : phytogénétique, amélioration des plantes, Citrus, Poncirus trifoliata, tétraploïdie, hybridation intergénérique, porte greffe

Mots-clés libres : Citrus rootstock, Tetraploid, Meiosis, Disomic, SNP, Genetic map, Recombination events

Classification Agris : F30 - Génétique et amélioration des plantes

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

Auteurs et affiliations

• Calvez Lény, CIRAD-BIOS-UMR AGAP (GLP)
• Dereeper Alexis, CIRAD-BIOS-UMR AGAP (GLP)
• Mournet Pierre, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0001-8011-8647
• Froelicher Yann, CIRAD-BIOS-UMR AGAP (FRA)
• Bruyère Saturnin, CIRAD-BIOS-UMR AGAP (GLP)
• Morillon Raphaël, CIRAD-BIOS-UMR AGAP (GLP)
• Ollitrault Patrick, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-9456-5517 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/597254/)

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