NDLI: Chromosomal polymorphism of ribosomal genes in the genus Oryza

Content Provider	Springer Nature Link
Author	Chung, Mei Chu Lee, Yung I Cheng, Yueh Yun Chou, Yi Jia Lu, Chia Fu
Copyright Year	2008
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 inversion and the amplification and transposition of rDNA might occur during Oryza species evolution. The possible mechanisms of cyto-evolution in tetraploid Oryza species are discussed.
Starting Page	745
Ending Page	753
Page Count	9
File Format	PDF
ISSN	00405752
Journal	Theoretical and Applied Genetics
Volume Number	116
Issue Number	6
e-ISSN	14322242
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-01-23
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biotechnology Biochemistry Plant Biochemistry Agriculture Plant Genetics & Genomics Plant Breeding/Biotechnology
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Biotechnology Agronomy and Crop Science

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