Ribosomal DNA, tri- and bi-partite pericentromeres in the permanent translocation heterozygote Rhoeo spathacea
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- 作者：Hieronim Golczyk (1)
Robert Hasterok (2)
Marek Szklarczyk (3) - 关键词：Pericentromere ; Permanent translocation heterozygosity ; rDNA ; Rhoeo
- 刊名：Cellular & Molecular Biology Letters
- 出版年：2010
- 出版时间：December 2010
- 年：2010
- 卷：15
- 期：4
- 页码：651-664
- 全文大小：1724KB
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Robert Hasterok (2)
Marek Szklarczyk (3)
1. Department of Plant Cytology and Embryology, Institute of Botany, Jagiellonian University, Grodzka 52, 31-044, Krak贸w, Poland
2. Department of Plant Anatomy and Cytology, University of Silesia, Jagiello艅ska 28, 40-032, Katowice, Poland
3. Department of Genetics, Plant Breeding and Seed Science, Agricultural University of Krakow, Al. 29 Listopada 54, 31-425, Krak贸w, Poland
文摘
High- and low-stringency FISH and base-specific fluorescence were performed on the permanent translocation heterozygote Rhoeo spathacea (2n = 12). Our results indicate that 45S rDNA arrays, rDNA-related sequences and other GC-rich DNA fraction(s) are located within the pericentromeric regions of all twelve chromosomes, usually colocalizing with the chromomycin A3-positive bands. Homogenization of the pericentromeric regions appears to result from the concerted spread of GC-rich sequences, with differential amplification likely. We found new 5S rDNA patterns, which suggest a variability in the breakpoints and in the consequent chromosome reorganizations. It was found that the large 5S rDNA locus residing on each of the 8E and 9E arms consisted of two smaller loci. On each of the two chromosome arms 3b and 4b, in addition to the major subtelomeric 5S rDNA locus, a new minor locus was found interstitially about 40% along the arm length. The arrangement of cytotogenetic landmarks and chromosome arm measurements are discussed with regard to genome repatterning in Rhoeo.