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Cyto genetic hazards from agricultural chemicals 7. herbicides fungicides and insecticides screened for effects on chiasmata in hordeum vulgare



Cyto genetic hazards from agricultural chemicals 7. herbicides fungicides and insecticides screened for effects on chiasmata in hordeum vulgare



Biologisches Zentralblatt 102(5): 571-576



Biocide (27), 8 insectides, 7 herbicides and 12 fungicides, are screened for effect on chiasmata by treating the seeds of barley with the test compounds during the S phase. Most of them reduced chiasma frequencies. Only 6 compounds reduced chiasma frequencies more than ethyl methanesulfonate and sodium azide used as positive controls. Organophosphate insecticides and fungicides may be acting directly, the former immediately at the seed stage, and the latter anywhere in the progeny. Some herbicides may act indirectly after metabolic modification by the seed metabolism. Many structurally related compounds elicited similar responses. The actual impact of pesticides in the field conditions is likely to be less than the present results suggest. The probability of chiasma frequency emerging as an acceptable endpoint in genetic toxicological testing is also indicated.

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