Search the Herbicide-Resistance Reference Database

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Thiel, H. ; Varrelmann, M.. 2014. Identification of a new PSII target site psbA mutation leading to D1 amino acid Leu₂₁₈Val exchange in the Chenopodium album D1 protein and comparison to cross-resistance profiles of known modifications at positions 251 and 264. Pest Management Science 70 : 278 - 285.

BACKGROUND: Resistance of Chenopodium album to triazinones and triazines can be caused by two amino acid exchanges, serine-264-glycine (Ser₂₆₄Gly) and alanine-251-valine (Ala₂₅₁Val), in the chloroplast D1 protein. This paper describes the identification of a biotype with a leucine-218-valine (Leu₂₁₈Val) switch found in German sugar beet fields with unsatisfactory weed control. A greenhouse experiment has been performed to compare the resistance profile of the newly identified biotype with biotypes that carry the Ser₂₆₄Gly and Ala₂₅₁Val mutations. RESULTS: Application rate-response curves obtained from the greenhouse experiment showed that the Leu₂₁₈Val exchange induced significant resistance against the triazinones but not against terbuthylazine. The level of resistance against the triazinones was higher in the Ser₂₆₄Gly and Ala₂₅₁Val biotypes compared with the Leu₂₁₈Val biotype. All biotypes tested were more resistant to metribuzin than to metamitron. Following terbuthylazine treatment, Ser₂₆₄Gly displayed a high level of resistance, Ala₂₅₁Val showed moderate resistance. A PCR-RFLP assay for Ser₂₆₄Gly has been extended to include detection of Ala₂₅₁Val and Leu₂₁₈Val mutations. CONCLUSION: The D1 Leu₂₁₈Val substitution in C. album confers significant resistance to triazinones. This suggests that Leu₂₁₈Val is involved in the binding of triazinones. First establishment of the resistance profiles of the three psbA mutations suggests that these mutations have been independently selected.

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, October 9, 2024 .  Available  www.weedscience.org
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