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

Frontiers in Plant Science
Dalel AhmedPatrick Ollitrault

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 al...Continue Reading

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Methods Mentioned

BETA
PCR
flow cytometry
genotyping

Software Mentioned

MapChart
TetraploidSNPMap
KlusterCaller
KASPar
ASMap
OneMap
MDSMap
R
qtl
PERGOLA

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