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

Autor: Luis Navarro, Pablo Aleza, Jose Juarez, Patrick Ollitrault, José Cuenca
Rok vydání: 2016
Předmět:
0106 biological sciences
0301 basic medicine
Citrus
Inheritance Patterns
Plant Science
Breeding
01 natural sciences
F30 - Génétique et amélioration des plantes
Génétique des populations
Chromosome Segregation
Marqueur génétique
Genetics
Likelihood Functions
F63 - Physiologie végétale - Reproduction
U10 - Informatique
mathématiques et statistiques
Inheritance (genetic algorithm)
food and beverages
General Medicine
Triploidy
medicine.anatomical_structure
Hybridation interspécifique
Plant biochemistry
Gamete
Ploidy
Méiose
Clementine
Génotype
Citrus sinensis
Heterozygote
Gamète
F60 - Physiologie et biochimie végétale
Biology
03 medical and health sciences
Variation génétique
medicine
fungi
Héritabilité
Diploidy
Amélioration des plantes
Ségrégation
030104 developmental biology
Genetic Loci
Citrus reticulata
Diploïdie
Germ Cells
Plant
U30 - Méthodes de recherche
Triploïdie
Agronomy and Crop Science
010606 plant biology & botany
Zdroj: Plant Cell Reports
ISSN: 1432-203X
0721-7714
DOI: 10.1007/s00299-016-1972-4
Popis: Tetraploid clementine displays mainly tetrasomic inheritance. Genetic structures of 2n SDR and 2 × gametes from DD clementine are complementary and will guides triploids citrus breeding strategies. 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.
Databáze: OpenAIRE
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