Reference "Ribosomal DNAs: an exception to the conservation of gene order in rice genomes"

Reference ID

4096

Title

Ribosomal DNAs: an exception to the conservation of gene order in rice genomes

Source

Molecular & General Genetics, 2000, vol. 263, pp. 586-591

Authors (3)

Shishido-R	Sano-Y
Fukui-K

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.