Abstract

A terrestrial green unicellular alga of the Ankistrodesmus falcatus genus vigorously degrades the 6-methyl-2,3-dithiolquinoxaline cyclocarbonate (quinomethionate or Q1), the active ingredient of Morestan.A toxicity level is determined for the alga when Q1, previously dissolved in dimethyl formamide is added to the cells.When added to the culture medium without anything else, Q1 is completely degraded. One of the metabolism pathways relates to the halogen metabolism and leads to the transformation of Q1 into an aminochlorinated compound identified as 6-methyl-2-amino-3-chloroquinoxaline. This compound is particularly toxic to cucumber plants.

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