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Molecular characterization and stress tolerance evaluation of new allotetraploid somatic hybrids between carrizo citrange and Citrus macrophylla W. rootstocks

Ruiz Marta, Pensabene-Bellavia Giovani, Quinones Anna, Garcia-Lor Andrés, Morillon Raphaël, Ollitrault Patrick, Primo-Millo Eduardo, Navarro Luis, Aleza Pablo. 2018. Molecular characterization and stress tolerance evaluation of new allotetraploid somatic hybrids between carrizo citrange and Citrus macrophylla W. rootstocks. Frontiers in Plant Science, 9:901, 22 p.

Journal article ; Article de recherche ; Article de revue à facteur d'impact Revue en libre accès total
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Quartile : Q1, Sujet : PLANT SCIENCES

Abstract : Polyploidy is one of the main forces that drives the evolution of plants and provides great advantages for breeding. Somatic hybridization by protoplast fusion is used in citrus breeding programs. This method allows combining the whole parental genomes in a single genotype, adding complementary dominant characters, regardless of parental heterozygosity. It also contributes to surpass limitations imposed by reproductive biology and quickly generates progenies that combine the required traits. Two allotetraploid somatic hybrids recovered from the citrus rootstocks—Citrus macrophylla (CM) and Carrizo citrange (CC)—were characterized for morphology, genome composition using molecular markers (SNP, SSR, and InDel), and their tolerance to iron chlorosis, salinity, and Citrus tristeza virus (CTV). Both hybrids combine the whole parental genomes even though the loss of parental alleles was detected in most linkage groups. Mitochondrial genome was inherited from CM in both the hybrids, whereas recombination was observed for chloroplastic genome. Thus, somatic hybrids differ from each other in their genome composition, indicating that losses and rearrangements occurred during the fusion process. Both inherited the tolerance to stem pitting caused by CTV from CC, are tolerant to iron chlorosis such as CM, and have a higher tolerance to salinity than the sensitive CC. These hybrids have potential as improved rootstocks to grow citrus in areas with calcareous and saline soils where CTV is present, such as the Mediterranean region. The provided knowledge on the effects of somatic hybridization on the genome composition, anatomy, and physiology of citrus rootstocks will be key for breeding programs that aim to address current and future needs of the citrus industry.

Mots-clés géographiques Agrovoc : Espagne

Classification Agris : F30 - Plant genetics and breeding
F02 - Plant propagation

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

Auteurs et affiliations

  • Ruiz Marta, IVIA (ESP)
  • Pensabene-Bellavia Giovani, IVIA (ESP)
  • Quinones Anna, IVIA (ESP)
  • Garcia-Lor Andrés, IVIA (ESP)
  • Morillon Raphaël, CIRAD-BIOS-UMR AGAP (GLP)
  • Ollitrault Patrick, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-9456-5517
  • Primo-Millo Eduardo, IVIA (ESP)
  • Navarro Luis, IVIA (ESP)
  • Aleza Pablo, IVIA (ESP) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/589131/)

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