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A 314-bp tandemly repeated DNA sequence, named pAc074, was characterized in Allium cepa by fluorescence in situ hybridization (FISH) analyses using random amplified fragment as probe. The nucleotide sequences of the clone pAc074 is partially homologous to the satellite DNA sequences, ACSAT1, ACSAT2, and ACSAT3, of A. cepa with 81%, 81% and 78% similarity, respectively. Our sequential C-banding and FISH with pAc074 probe also clearly showed a close relation between Cheterochromatin at telomeric region and pAc074 sequences on all the chromosomes except on chromosome 6. On the long arm of chromosome 7, pAc074 sequences appeared as interstitial band which did not correspond to C-heterochromatin bands. Instead, the C-heterochromatin bands corresponded with the 5S rDNA signals. This is the first evidence of simultaneous banding of the 5S rDNA and C-band in A. cepa.

Identification and Chromosomal Location of Tandemly Repeated DNA Sequences in Allium cepa.