Preferential Disomic Segregation and C. micrantha/C. medica Interspecific Recombination in Tetraploid 'Giant Key' Lime; Outlook for Triploid Lime Breeding.

Publication Overview
TitlePreferential Disomic Segregation and C. micrantha/C. medica Interspecific Recombination in Tetraploid 'Giant Key' Lime; Outlook for Triploid Lime Breeding.
AuthorsAhmed D, Curk F, Evrard JC, Froelicher Y, Ollitrault P
TypeJournal Article
Journal NameFrontiers in plant science
Volume11
Year2020
Page(s)939
CitationAhmed D, Curk F, Evrard JC, Froelicher Y, Ollitrault P. Preferential Disomic Segregation and C. micrantha/C. medica Interspecific Recombination in Tetraploid 'Giant Key' Lime; Outlook for Triploid Lime Breeding.. Frontiers in plant science. 2020; 11:939.

Abstract

The triploid 'Tahiti' lime (C. x latifolia (Yu. Tanaka) Tanaka) naturally originated from a merger between a haploid ovule of lemon (C. x limon (L.) Burm) and a diploid pollen from a 'Mexican' lime (C. x aurantiifolia (Christm.) Swing). The very limited natural inter-varietal diversity and gametic sterility of C. latifolia requires a phylogenomic based reconstruction breeding strategy to insure its diversification. We developed a strategy based on interploid hybridization between diploid lemon and the doubled diploid 'Giant Key' lime. This lime is a doubled diploid of 'Mexican' lime, itself a natural interspecific F1 hybrid between C. medica L. and C. micrantha Wester. For an optimized breeding program, we analyzed the meiotic behavior of the allotetraploid lime, the genetic structure of its diploid gametes, the interspecific recombination between C. medica and C. micrantha, and constructed its genetic map. A population of 272 triploid hybrids was generated using 'Giant Key' lime as pollinator. One hundred fifty-eight SNPs diagnostic of C. micrantha, regularly distributed throughout the citrus genome were successfully developed and applied. The genetic structure of the diploid gametes was examined based on C. micrantha doses along the genome. The diploid gametes transmitted in average 91.17% of the parental interspecific C. medica/C. micrantha heterozygosity. Three chromosomes (2, 8, and 9) showed disomic segregation with high preferential pairing values, while the remaining chromosomes showed an intermediate inheritance with a preferential disomic trend. A total of 131 SNPs were assigned to nine linkage groups to construct the genetic map. It spanned 272.8 cM with a low average recombination rate (0.99 cM Mb-1) and high synteny and colinearity with the reference clementine genome. Our results confirmed that an efficient reconstruction breeding strategy for 'Tahiti' lime is possible, based on interploid hybridization using a doubled diploid of C. aurantiifolia. The tetraploid parent should be selected for favorable agronomic traits and its genetic value should be efficiently inherited by the progeny thanks to transmission of the high level of parental heterozygosity. However, it would require developing numerous progeny to overcome the linkage drag caused by the limited interspecific recombination associated with the predominant disomic inheritance.

Featuremaps
This publication contains information about 1 maps:
Map Name
Citrus-GiantKeyLime-F1
Stocks
This publication contains information about 2 stocks:
Stock NameUniquenameType
Giant Key LimeGiant Key Limecultivar
Lemon/GiantKeyLime-F1Lemon/GiantKeyLime-F1population
Properties
Additional details for this publication include:
Property NameValue
Publication ModelElectronic-eCollection
ISSN1664-462X
pISSN1664-462X
Publication Date2020
Journal AbbreviationFront Plant Sci
DOI10.3389/fpls.2020.00939
Elocation10.3389/fpls.2020.00939
CopyrightCopyright © 2020 Ahmed, Curk, Evrard, Froelicher and Ollitrault.
LanguageEnglish
Language Abbreng
Publication TypeJournal Article
Journal CountrySwitzerland
Cross References
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DatabaseAccession
PMID: PubMedPMID:32670332