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Genomic characterization of Oryza species-specific CACTA-like transposon element and its application for genomic fingerprinting of rice varieties



Genomic characterization of Oryza species-specific CACTA-like transposon element and its application for genomic fingerprinting of rice varieties



Molecular Breeding 21(3): 283-292



A repeated DNA fragment (pKRD) was isolated from the genomic library of weedy rice in Korea. The pKRD showed significant homology to Em/Spm CACTA-like transposon in whole genome sequences of rice released in the Blast rice sequence database of NCBI and was closely related to the TNP2 transposase group, including a TNP-like transposable element of rice. A Southern hybridization experiment demonstrated that the pKRD sequence is unique to the Oryza genome. The 126 sequences homologous to pKRD were evenly distributed in all 12 different chromosomes in rice genomes with multiple copy numbers. Different copy numbers ranging from 1,500 to 4,500 corresponding to rice species were detected by slot blot hybridization. In a DNA fingerprinting experiment, a pKRD probe was assessed to be the potential molecular marker for studying evolution and divergence, biodiversity and phylogenic analysis of rice species.

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Accession: 021089941

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DOI: 10.1007/s11032-007-9128-4


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