Genes and Genomics

The Genetics Society of Korea (한국유전학회)
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Dual‐color FISH karyotype analyses using rDNAs in three Cucurbitaceae species

Waminal, Nomar Espinosa;Kim, Nam-Soo;Kim, Hyun Hee

  • Published : 20111000
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Abstract

Dual-color fluorescence in situ hybridization (FISH) analysis of three Cucurbitaceae species from different genera was conducted using 5S and 45S rDNA probes. In Benincasa hispida (Thunb.) Cogn. (2n=24), the 45S rDNA probe hybridized on two chromosomes, one in the short arm of a medium-sized metacentric chromosome and another at the satellite of a chromosome. The 5S rDNA hybridized at a site proximal to the centromere of the same short arm of the 45S rRNA gene locus that occupied almost the entire short arm. For Citrullus lanatus (Thunb.) Matsum & Nakai (2n=22), the 45S rDNA probe hybridized at sites in the short arms of two chromosomes and the 5S rDNA probe was co-localized with the 45S rRNA locus at the region proximal to the centromere in one chromosome. The 45S rRNA loci occupied almost all of the short arms in both chromosomes. In Cucurbita moschata Duch. (2n=40), the 45S rDNA probe hybridized in five chromosomes in which the 45S rRNA genes occupied almost two-thirds of the chromosomes in two large chromosomes and the entire short arm of a medium-sized chromosome. Two other loci were present in two medium-sized chromosomes, one in the proximal region in the short arm of a chromosome and another at the tip of the long arm of a chromosome. Chromosomes of B. hispida were relatively larger than those of the other two species. The karyotype of B. hispida is composed of two metacentrics and 10 submetacentrics, while that of C. lanatus is composed of seven metacentrics and four submetacentrics and that of C. moschata is composed of 18 metacentrics and two submetacentrics. Comparative chromosome evolution among the three Cucurbitaceae species was attempted using the karyotypes and the chromosomal dis- tribution patterns of the 5S and 45S rDNAs. The results presented herein will be useful in elucidating the phylogenetic relationships among Cucurbitaceae species, and will provide basic data for their breeding programs.

Keywords

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