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http://dx.doi.org/10.7732/kjpr.2017.30.6.654

Cytogenetic Mapping of Carthamus tinctorius L. with Tandemly Repeated DNA Sequences by Fluorescence in situ Hybridization  

Mancia, Franklin Hinosa (Department of Environmental Horticulture, Sahmyook University)
Ju, Yoon Ha (Department of Convergence Science, Sahmyook University)
Lim, Ki-Byung (Department of Horticultural Science, Kyungpook National University)
Kim, Jung Sun (National Institute of Agricultural Science, Rural Development Administration)
Nam, Sang Yong (Department of Environmental Horticulture, Sahmyook University)
Hwang, Yoon-Jung (Department of Environmental Horticulture, Sahmyook University)
Publication Information
Korean Journal of Plant Resources / v.30, no.6, 2017 , pp. 654-661 More about this Journal
Abstract
Dual-color fluorescence in situ hybridization karyotype analysis was created using repetitive sequences including two types of rDNA repeats (45S and 5S rDNAs) and Arabidopsis-type telomere sequence repeats. The somatic metaphase cells of Carthamus tinctorius were observed as diploids (2n=2x=24). A symmetrical or slightly asymmetrical karyotype with seven pairs of metacentric and five pairs of submetacentric chromosomes was observed. The lengths of the somatic metaphase chromosomes ranged from 4.18 to $6.53{\mu}m$, with a total length of $60.71{\mu}m$. One locus of 45S rDNA was located on the pericentromeric regions of three pairs of chromosomes and the other pair was situated on the terminal regions of the short arms of a single pair of chromosomes. One locus of 5S rDNA was detected on the interstitial regions of the short arms of two pairs of chromosomes. Arabidopsis-type telomeric repeats were detected on the terminal regions of all pairs of chromosomes. Co-localization of loci between telomeric repeats and 45S rDNA was observed in a single pair of chromosomes. The results provide additional information for the existing physical mapping project of C. tinctorius and will also serve as a benchmark to a more intricate cytogenetic investigation of C. tinctorius and its related species.
Keywords
FISH; Karyotype; rDNAs; Telomeric repeats;
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