Ribosomal DNAs: an exception to the conservation of gene order in rice genomes (original) (raw)

Abstract

rDNA (18S-5.8S-25S rDNA) and 5S rDNA loci were visualized on the chromosomes of six species of the genus Oryza by fluorescence in situ hybridization (FISH) and the labeled rice chromosomes were identified based on their condensation patterns. As a result, the chromosomes harboring rDNA and/or 5S rDNA loci were determined in the complement for all the known rice genomes. Variation in the location of the rDNA loci indicated the transpositional nature of the rDNAs in the genus Oryza, as also suggested in Triticeae and Allium. Comparative analysis of the locations of rDNA loci among rice, maize and wheat revealed that variability in the physical location of the rDNA loci was characteristic of the genus Oryza and also of the genera of Gramineae. This variability in the location of the rDNA loci between evolutionarily related species is in sharp contrast to the conservation of the general order of genes in their genomes.

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Authors and Affiliations

  1. Department of Plant Science and Resources, College of Bioresource Sciences, Nihon University, Fujisawa 252-8510, Japan, , , , , , JP
    R. Shishido
  2. Plant Breeding Institute, Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan, , , , , , JP
    Y. Sano
  3. Department of Biotechnology, Graduate School of Engineering, Osaka University, Suita 565-0871, Japan E-mail: kfukui@cell.bio.osaka-u.ac.jp Tel.: +81-6-68797440; Fax: +81-6-68797441, , , , , , JP
    K. Fukui

Authors

  1. R. Shishido
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  2. Y. Sano
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  3. K. Fukui
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Received: 3 August 1999 / Accepted: 7 January 2000

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Shishido, R., Sano, Y. & Fukui, K. Ribosomal DNAs: an exception to the conservation of gene order in rice genomes.Mol Gen Genet 263, 586–591 (2000). https://doi.org/10.1007/s004380051205

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