Absorption, translocation and metabolism of metamitron in Chenopodium album

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

来源：Pest Management Science, 2012, 68(2): 209-216.

DOI：10.1002/ps.2246

• herbicide resistance
• herbicide tolerance
• photosystem II
• triazines
• triazinones
• common lambsquarters

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. %26lt;br%26gt;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 metamitronwas absorbed by the roots. The primary products of metamitronmetabolismwere 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. %26lt;br%26gt;CONCLUSION: Metamitron metabolism in C. album may act as a basic tolerance mechanism, which can be important in circumstances favouring this degradation pathway.

• 出版日期2012-2