Abstract
Concentrated glucose solutions (20%) receiving 0·5–2·0 Mrad of γ rays ( 60Co) were diluted to 2% and used to treat lateral roots of Vicia and adventitious roots of Tradescantia. Studies of the cell samples fixed at successive intervals through the mitotic cycle indicated early interphase to be the stage most sensitive to the treatment. Dosage effect was demonstrated in roots treated with fresh irradiated glucose solution for longer duration. Of the three main types of breakage induced by irradiated glucose solution, centromeric and secondary constructional breaks were more prevalent, and they were caused by long-lived radiolytic derivatives of glucose; chromatid breaks were relatively infrequent, and they were caused by shortlived radiolytic derivatives of glucose. A comparative study on the centromeric breakage rates between Vicia and Tradescantia confirmed that the centromeric breaks occurred preferentially in metacentric chromosomes. Control groups treated with non-irradiated glucose solution for 6 hr showed a higher rate of centromeric and secondary constrictional breaks than a baseline control which received no treatment.
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