Fluorescence in situ hybridization (FISH) is a conventional method used to visualize the distribution of DNA elements within a genome. To examine the relationships within the Chrysanthemum genus, ribosomal DNA (rDNA), a popular cytogenetic marker, was utilized as a probe for FISH within this genus. Based on the genome data of Chrysanthemum nankingense, C. seticuspe and its allied genera in the Compositae(Asteraceae), we explored rDNA sequences to design oligonucleotide probes and perform oligonucleotide fluorescence in situ hybridization (Oligo-FISH) in eight Chrysanthemum accessions. The results showed that the majority of 5S rDNA signals were located in subterminal chromosome regions and that the number of 5S rDNA sites might be tightly associated with ploidy. For 45S rDNA sites, the number and intensity of signals differed from those of previously investigated Chrysanthemum resources. These findings may provide an optimally reliable method of examining the chromosome composition and structural variation of Chrysanthemum and its related species and allow researchers to understand the evolutionary history and phylogenetic relationships of Chrysanthemum.
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This research was supported by the National Key Research and Development Program of China (2018YFD1000401), the Natural Science Fund of Qinghai Province, China (2018-Hz-819), a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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He, J., Lin, S., Yu, Z. et al. Identification of 5S and 45S rDNA sites in Chrysanthemum species by using oligonucleotide fluorescence in situ hybridization (Oligo-FISH). Mol Biol Rep 48, 21–31 (2021). https://doi.org/10.1007/s11033-020-06102-1
- Fluorescence in situ hybridization (FISH) 5S rDNA 45S rDNA
- Chrysanthemum oligonucleotide