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<p>Redroot pigweed (<i>Amaranthus retroflexus</i>&#xa0;L.) is one of the most problematic weeds worldwide that threatens agricultural productivity. In recent years, reduced control of <i>A.&#xa0;retroflexus</i> with metribuzin has been reported in potato fields in Turkey, highlighting the need to assess herbicide resistance in field populations. In this context, a&#xa0;two-year field experiment was conducted to evaluate metribuzin resistance in <i>A.&#xa0;retroflexus</i> populations and investigate its potential molecular basis. Preliminary screening indicated that, among 49&#xa0;populations from fields with reported metribuzin failure and two susceptible reference populations, 18&#xa0;populations exhibited confirmed resistance and were selected for further evaluation. Whole-plant dose–response assays using eight metribuzin concentrations (resistant populations: 0,&#xa0;131.25, 262.5, 525, 1050, 2100, 4200, and 8400 g&#xa0;a.i.&#xa0;ha⁻<sup>1</sup>; susceptible populations: 0,&#xa0;32.81, 65.62, 131.25, 262.5, 525, 1050, and 2100 g&#xa0;a.i.&#xa0;ha⁻<sup>1</sup>) revealed that resistant populations were 3.43- to 21.18-fold less sensitive to metribuzin than susceptible populations.</p><p>Sequencing of the psbA gene revealed no substitutions in the established PSII inhibitor target-site resistance region (codons 218–275). Although a&#xa0;Phe33Leu substitution was detected in two populations, this change lies outside the known resistance-associated region and has not been previously linked to PSII-inhibitor resistance. These findings suggest that resistance is likely mediated by non-target-site mechanisms. The presence of metribuzin-resistant <i>A.&#xa0;retroflexus </i>populations demonstrates the importance of adopting integrated weed management strategies to prevent the spread of resistant populations in Turkey. Future studies are recommended to elucidate the molecular mechanisms associated with resistance.</p>

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The First Report of Metribuzin-Resistant Amaranthus retroflexus from Potato Fields in Turkey

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Mona Sayyah,
  • Khawar Jabran

摘要

Redroot pigweed (Amaranthus retroflexus L.) is one of the most problematic weeds worldwide that threatens agricultural productivity. In recent years, reduced control of A. retroflexus with metribuzin has been reported in potato fields in Turkey, highlighting the need to assess herbicide resistance in field populations. In this context, a two-year field experiment was conducted to evaluate metribuzin resistance in A. retroflexus populations and investigate its potential molecular basis. Preliminary screening indicated that, among 49 populations from fields with reported metribuzin failure and two susceptible reference populations, 18 populations exhibited confirmed resistance and were selected for further evaluation. Whole-plant dose–response assays using eight metribuzin concentrations (resistant populations: 0, 131.25, 262.5, 525, 1050, 2100, 4200, and 8400 g a.i. ha⁻1; susceptible populations: 0, 32.81, 65.62, 131.25, 262.5, 525, 1050, and 2100 g a.i. ha⁻1) revealed that resistant populations were 3.43- to 21.18-fold less sensitive to metribuzin than susceptible populations.

Sequencing of the psbA gene revealed no substitutions in the established PSII inhibitor target-site resistance region (codons 218–275). Although a Phe33Leu substitution was detected in two populations, this change lies outside the known resistance-associated region and has not been previously linked to PSII-inhibitor resistance. These findings suggest that resistance is likely mediated by non-target-site mechanisms. The presence of metribuzin-resistant A. retroflexus populations demonstrates the importance of adopting integrated weed management strategies to prevent the spread of resistant populations in Turkey. Future studies are recommended to elucidate the molecular mechanisms associated with resistance.