The reversal of Dalapon toxicity by microbial action

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Abstract
A Micrococcus sp., similar to M. flavus, was found to reverse the inhibitory effects of 2,2-dichloropropionic acid (Dalapon) on an unidentified Agarbacterium sp. Neither organism could be shown to degrade the herbicide, as determined by Cl− release or disappearance of the agent from the medium. Bioassay of the filtered micrococcal broth revealed the presence of pantothenic acid. β-Alanine, valine, and alpha-ketoisovalerate could not overcome the herbicide's inhibitory effects on the Agarbacterium, but sodium pamoate produced a slight increase in growth. Calcium pantothenate (0.05 ug/ml) allowed the same amount of growth of the Agarbacterium in Dalapon medium as did the micrococcal filtrate. The finding suggests that an "associative action" of microorganisms may play an important role in microbial resistance to herbicides.

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