Abstract
The cytogenetic effects of 4 concentrations of the herbicide isoproturon on mitosis in roots of Allium cepa and Hordeum vulgare treated for 4 and 24 hr have been investigated. Isoproturon considerably reduced mitotic activity and exerted a disruptive action on the spindle apparatus, resulting in C-metaphase figures, doubled chromosome number, chromosome lagging and multipolar anaphases and telophases. Isoproturon also induced chromosomal breakage, stickiness and bridges. The abnormalities produced in Allium and Hordeum were similar, but comparisons of the frequencies of abnormalities in both plants indicated that Allium is the more susceptible to the mitodepressive and chromotoxic actions of the herbicide.
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