Chromosomal polymorphism of ribosomal genes in the genus Oryza.

TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik
Mei-Chu ChungChia-Fu Lu

Abstract

The genes encoding for 18S-5.8S-28S ribosomal RNA (rDNA) are both conserved and diversified. We used rDNA as probe in the fluorescent in situ hybridization (rDNA-FISH) to localized rDNAs on chromosomes of 15 accessions representing ten Oryza species. These included cultivated and wild species of rice, and four of them are tetraploids. Our results reveal polymorphism in the number of rDNA loci, in the number of rDNA repeats, and in their chromosomal positions among Oryza species. The numbers of rDNA loci varies from one to eight among Oryza species. The rDNA locus located at the end of the short arm of chromosome 9 is conserved among the genus Oryza. The rDNA locus at the end of the short arm of chromosome 10 was lost in some of the accessions. In this study, we report two genome specific rDNA loci in the genus Oryza. One is specific to the BB genome, which was localized at the end of the short arm of chromosome 4. Another may be specific to the CC genome, which was localized in the proximal region of the short arm of chromosome 5. A particular rDNA locus was detected as stretched chromatin with bright signals at the proximal region of the short arm of chromosome 4 in O. grandiglumis by rDNA-FISH. We suggest that chromosomal inv...Continue Reading

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Citations

Feb 24, 2009·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·G RobledoG Seijo
Jul 14, 2010·Journal of Plant Research·Kenji FukushimaYoshikazu Hoshi
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Jul 18, 2020·Comparative Cytogenetics·Chao-Wen SheChun-Ping He
Jun 22, 2021·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·Manman QuYonghua Han
Oct 28, 2009·Molecular Phylogenetics and Evolution·Ying BaoSong Ge

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Methods Mentioned

BETA
Rice Genome Sequencing

Software Mentioned

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Adobe Photoshop
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