Absorption, translocation and metabolism of metamitron in Chenopodium album

Jonas Aper*, Els Mechant, Baruch Rubin, Arne Heyerick, Gert Callebaut, Sven Mangelinckx, Dieter Deforce, Norbert De Kimpe, Robert Bulcke, Dirk Reheul

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Background: In recent years, common lambsquarters (Chenopodium album L.) populations from sugar beet fields in different European countries have responded as resistant to the as-triazinone metamitron. The populations have been found to have the same D1 point mutation as known for atrazine-resistant biotypes (Ser 264 to Gly). However, pot experiments revealed that metamitron resistance is not as clear-cut as observed with triazine resistance in the past. The objectives of this study were to clarify the absorption, translocation and metabolic fate of metamitron in C. album. Results: Root absorption and foliar absorption experiments showed minor differences in absorption, translocation and metabolism of metamitron between the susceptible and resistant C. album populations. A rapid metabolism in the C. album populations was observed when metamitron was absorbed by the roots. The primary products of metamitron metabolism were identified as deamino-metamitron and metamitron-N-glucoside. PABA, known to inhibit the deamination of metribuzin, did not alter the metabolism of metamitron, and nor did the cytochrome P450 inhibitor PBO. However, inhibition of metamitron metabolism in the presence of the cytochrome P450 inhibitor ABT was demonstrated. Conclusion: Metamitron metabolism in C. album may act as a basic tolerance mechanism, which can be important in circumstances favouring this degradation pathway.

Original languageEnglish
Pages (from-to)209-216
Number of pages8
JournalPest Management Science
Volume68
Issue number2
DOIs
StatePublished - Feb 2012

Keywords

  • Common lambsquarters
  • Herbicide resistance
  • Herbicide tolerance
  • Photosystem II
  • Triazines
  • Triazinones

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