Cross-resistance patterns to ACCase-inhibitors in American sloughgrass (Beckmannia syzigachne Steud.) homozygous for specific ACCase mutations

Pesticide Biochemistry and Physiology
Long DuJinxin Wang

Abstract

American sloughgrass is a troublesome annual grass weed in winter wheat field rotated with rice in China. The overreliance on acetyl-coenzyme A carboxylase (ACCase) inhibiting herbicides has resulted in resistance evolution in this weed. In this study, the cross-resistance patterns to fenoxaprop-p-ethyl, clodinafop-propargyl, fluazifop-p-butyl, haloxyfop-p-methyl, sethoxydim, clethodim and pinoxaden were established using purified plants individually homozygous for specific mutant ACCase alleles. Results indicated that 1781Leu allele endows high-level resistance to APPs, CHDs and pinoxaden while confers moderate resistance to haloxyfop-p-methyl. The 2027Cys and 2041Asn alleles endow high-level resistance to APPs and pinoxaden and lower level resistance to CHDs. The 2078Gly allele confers high-level resistance to all herbicides tested in this study, however, moderate resistance to sethoxydim. The 2096Ala very likely endows high-level resistance to fluazifop-p-butyl, haloxyfop-p-methyl and moderate resistance to sethoxydim. In addition, one undefined resistance mechanism was involved in population SD-04.

References

Mar 9, 2000·Trends in Plant Science·D Werck-ReichhartL Didierjean
Dec 8, 2004·Plant Physiology·Christophe DélyeStephen B Powles
Mar 16, 2007·Proceedings of the National Academy of Sciences of the United States of America·Wenjie LiuRichard R Williams
Dec 8, 2010·Proceedings of the National Academy of Sciences of the United States of America·Linda P C YuLiang Tong
Jun 7, 2011·Journal of Agricultural and Food Chemistry·Hugo Cruz-HipolitoRafael De Prado

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