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Abstract
A technique is described for differential staining of sister chromatids and the study of sister chromatid exchanges (SCEs) in garlic (Allium sativum L.) callus cells. BrdU incorporation into newly synthesized DNA was ensured by culturing calli on medium containing 100 μM BrdU+0.01 μM FudR+1 μM Urd. SCEs were visualized by FPG staining technique and their frequency was analysed. Mean frequency of SCEs in callus cells was higher than that in meristem root-tip cells. Using the same staining method, cell cycle time of callus cells was analysed. It was found that it ranges from 48 to 132 hrs. The method described represents a new approach in the study of genetic instability of plant cells cultured in vitro.
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