Abstract
SCEs were studied in the chromosomes of Allium cepa L. stained by the FPG technique at the second and third divisions after BrdU-substitution during only the first replication round or the three consecutive cycles, respectively. Cells were cultured in the dark and exposed to visible light at different moments throughout the three cycles. The results obtained show that visible light-illumination, which has no apparent effect upon native DNA, is able to increase the frequency of SCEs in BrdU-substituted chromosomes. The comparison of expected and observed figures clearly reveals that BrdU-substituted DNA is the target of visible light. Finally, the formation of visible light-induced SCEs in BrdU-substituted chromosomes appears to be an S-dependent process, even though a post-replicational mechanism closely associated with semi-conservative S phase replication might be responsible.
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