Abstract
Fluorescence in situ hybridization (FISH) was applied to somatic chromosomes preparations of Oryza officinalis Wall. (CC), O. sativa L. (AA)×O. officinalis F1 hybrid (AC), backcross progenies BC1 (AAC and ACC), O. latifolia Desv. (CCDD), O. alta Swallen (CCDD) and O. punctata Kotschy (BBCC) with a labelled probe of C 0 t-1 DNA from O. officinalis. In O. officinalis, the homologous chromosomes showed similar signal bands probed by C 0 t-1 DNA and karyotype analysis was conducted based on the band patterns. Using no blocking DNA, the probe identified the chromosomes of C genome clearly, but detected few signals on chromosomes of A genome in the F1 hybrid and two backcross progenies of BC1. It is obvious that the highly and moderately repetitive DNA sequences were considerably different between C and A genomes. The chromosomes of C genome were also discriminated from the chromosomes of D-and B-genome in the tetraploid species O. latifolia, O. alta and O. punctata by C 0 t-1 DNA-FISH. Comparison of the fluorescence intensity on the chromosomes of B, C and D genomes in O. latifolia, O. alta, and O. punctata indicated that the differentiations between C and D genomes are less than that between C and B genomes. The relationship between C and D genomes in O. alta is closer than that of C and D genomes in O. latifolia. This would be one of the causes for the fact that both the genomes are of the same karyotype (CCDD) but belong to different species. The above results showed that the C 0 t-1 DNA had a high specificity of genome and species. In this paper, the origin of allotetraploid in genus Oryza is also discussed.
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Lan, W., Qin, R., Li, G. et al. Comparative analysis of A, B, C and D genomes in the genus Oryza with C 0 t-1 DNA of C genome. CHINESE SCI BULL 51, 1710–1720 (2006). https://doi.org/10.1007/s11434-006-2049-5
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DOI: https://doi.org/10.1007/s11434-006-2049-5