Abstract
The cytogenetic characterization of the carrot genome (Daucus carota L., 2n = 18) has been limited so far, partly because of its somatic chromosome morphology and scant of chromosome markers. Here, we integrate the carrot linkage groups with pachytene chromosomes by fluorescent in situ hybridization (FISH) mapping genetically anchored bacterial artificial chromosomes (BACs). We isolated a satellite repeat from the centromeric regions of the carrot chromosomes, which facilitated the study of the pachytene-based karyotype and demonstrated that heterochromatic domains were mainly confined to the pericentromeric regions of each chromosome. Chromosome-specific BACs were used to: (1) physically locate genetically unanchored DNA sequences, (2) reveal relationships between genetic and physical distances, and (3) address chromosome evolution in Daucus. Most carrot BACs generated distinct FISH signals in 22-chromosome Daucus species, providing evidence for syntenic chromosome segments and rearrangements among them. These results provide a foundation for further cytogenetic characterization and chromosome evolution studies in Daucus.
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Abbreviations
- BAC:
-
Bacterial artificial chromosome
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- FISH:
-
Fluorescent in situ hybridization
- LG:
-
Linkage group
- STS:
-
Sequence-tagged site marker
- SSR:
-
Simple sequence repeats
- SCAR:
-
Sequence-characterized amplified region
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Acknowledgment
We thank Dr. Jiri Macas for his invaluable help in the analysis of the BAC sequences generated in this work.
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Responsible Editor: Pat Heslop-Harrison.
Sequence data from this article have been deposited with the EMBL/GenBank Data Libraries under accession no. HM565961.
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Iovene, M., Cavagnaro, P.F., Senalik, D. et al. Comparative FISH mapping of Daucus species (Apiaceae family). Chromosome Res 19, 493–506 (2011). https://doi.org/10.1007/s10577-011-9202-y
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DOI: https://doi.org/10.1007/s10577-011-9202-y