Abstract
The cytotoxic and mutagenic effects of the synthetic auxin 2,4-dichlorophenoxyacetic acid (2,4-D) on shallot root tip cells and on V79 Chinese hamster fibroblast cells were examined and compared. In shallot root tips 2,4-D caused changes in mitotic activity, as well as changes in chromosome and chromatin structure, and also changes during the cell cycle. 2,4-D also showed mutagenic and cytotoxic effects on V79 cells in culture in concentrations higher than 10 μg/ml. The results in both systems (plant and mammalian cells) were in agreement showing mutagenic activity of 2,4-D in the concentration range higher than usually used in establishing plant tissue culture (> 5 μg/ml).
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