Abstract
The action of Streptomycin upon the mitotic cells of Tradescantia paludosa has been studied cytologically. The concentration of the anti-biotic ranged from 25ppm to 1000ppm (parts per million).Every kind of cytological disi-option, comparable to those inducible by x-ray irradiation or the action of mutagenic chemicals, has been observed in contrast to the rather slight cytological disruption heretofore reported.Taking into consideration all the data now available, concerning the effect of Streptomycin upon either microorganisms or higher plants, it seems most likely that the action of Streptomycin upon mitotic cells is to be mutagenic, and is able to induce both minor genie recombinations and major alterations such as translocation or polyploidy.
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