incorporation of thymidine into onion root meristematic cell nuclei in presence of hydroxyurea and its role in recovery of mitotic activity
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ID: 149827
2015
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Abstract
Hydroxyurea treatment of onion roots induced mitotic block which was released by transfer of bulbs to water, and also to some extent by addition of cold or 3H-thymidine to hydroxyurea solutions. In presence of hydroxyurea there was noted very intense incorporation of 3H-thymidine into cell nuclei, giving labelling index of 40-70%. However, all the mitotic figures appearing in presence of hydroxyurea and 3H-thymidine were unlabelled. On the other hand, labelled mitotic figures were obtained when roots incubated with 3H-thymidine in presence of hydroxyurea had been transferred to water. Incorporation of 3H-uridine was unaffected by hydroxyurea. The results show that hydroxyurea arrests onion root meristematic cells, either in the S phase and the G2 phase. Enhanced incorporation of 3H-thymidine in the presence of hydroxyurea, and release by added thymidine of the mitotic block indicate that hydroxyurea induces in onion root meristematic cells a particular shortage of thymidylate.
| Reference Key |
habdas2015actaincorporation
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|---|---|
| Authors | ;H. Habdas |
| Journal | our dermatol online |
| Year | 2015 |
| DOI |
10.5586/asbp.1977.057
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