New mutations for herbicide resistance rarer than expected, study finds

After exposing more than 70 million grain amaranth seeds to a soil-based herbicide, researchers were not able to find a single herbicide-resistant mutant. Though preliminary, the findings suggest that the mutation rate in amaranth is very low, and that low-level herbicide application contributes little—if anything—to the onset of new mutations conferring resistance, researchers say.

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