Abstract
Most citrus tristeza virus (CTV) strains infect almost all Citrus species and have caused serious damage on citrus production in many countries. Poncirus trifoliata (trifoliate orange) has a single dominant resistance gene effective against a broad range of CTV strains. P. trifoliata is sexually compatible with Citrus species, and introgression breeding programs have been initiated to introduce the CTV resistance into Citrus. “Kankitsu Chukanbohon Nou 8 Gou” (Nou-8) was developed by crossing Citrus sp. “Kiyomi” with an F1 hybrid derived from Citrus hassaku × P. trifoliata, but it still had undesirable eating traits. In aim to progress marker-assisted introgression breeding for CTV resistance efficiently, we selected 189 DNA markers which could be applied to genotyping for Citrus and P. trifoliata and constructed a genetic linkage map of Nou-8. The map included 189 DNA markers on 10 linkage groups and extended about 722.8 cM in total length. CTV resistance locus was located at 2.4 cM position in linkage group 02_(1), with the same location found when progeny were scored for resistance using an ELISA assay and for DNA marker for CTV resistant (CTV103). Graphical genotypes of Nou-8 and its progeny suggested that (1) 36 % of the chromosome in the BC’2 population were inherited from Nou-8 without any recombination sites, (2) Nou-8 had been already completely substituted by Citrus genotype in two linkage groups, and (3) four of 93 progeny of Nou-8 had recombination sites in the flanking region of the CTV resistance gene locus.
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Acknowledgments
This work was supported by a grant from the Ministry of Agriculture, Forestry, and Fisheries of Japan (Genomics-based Technology for Agricultural Improvement, GMO-1003).
Data archiving statement
Genetic map is now under process of submission to Citrus Genome Database and will be completed during the review.
Ethical standards
The experiments comply with the current laws of Japan where they were performed.
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Communicated by W.-W. Guo
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Ohta, S., Endo, T., Shimada, T. et al. Construction of genetic linkage map and graphical genotyping of pseudo-backcrossed F2 (BC’2) progeny to introduce a CTV resistance from Poncirus trifoliata (L.) Raf. into Citrus by introgression breeding. Tree Genetics & Genomes 11, 797 (2015). https://doi.org/10.1007/s11295-014-0797-y
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DOI: https://doi.org/10.1007/s11295-014-0797-y