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The purpose of this work was to investigate the in‐vivo mode of action of glufosinate in comparison with that of the known glutamine synthetase inhibitor, methionine sulfoxmine, in photoautotrophic microorganisms. Using the eukaryotic green alga Chlorella fusca (Shih. & Krauss) and the cyanobacterium Anacystis nidulans (Kratz & Myers), currently developed [15N]NMR pulselabelling techniques have been employed to study the inhibition of ammonia assimilation. The results show that, while methionine sulfoximine immediately blocks glutamine synthesis, glufosinate action requires an induction process in both organisms investigated, possibly indicating the de‐novo synthesis of an amino acid membrane carrier. In addition, the observed ability of C. fusca to incorporate nitrogen into glutamate under glutamine synthetase‐inhibiting conditions is explicable by an anabolic function of a glutamate dehydrogenase in this organism. This might explain the large differences in observed species sensitivity to glufosinate exposure.
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Altenburger et al. (1995) studied this question.
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