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<p>The spread of glyphosate resistance in feathertop Rhodes grass (FTR) (<i>Chloris virgata</i> Sw.) is a&#xa0;significant concern in Australian pastures and crop fields, requiring the evaluation of alternative strategies for managing this weed. In this study, we assessed the growth and seed production of six glyphosate-resistant (GR) and six glyphosate-susceptible (GS) populations of FTR in the presence and absence of interference from Gatton panic (<i>Megathyrsus maximus</i>) pasture plants. The presence of Gatton panic resulted in more than an 85% decrease in productivity-related parameters, including leaf number, dry matter, panicle number, and seed production, in both GR and GS FTR populations. No significant differences were observed between GR and GS populations, indicating no fitness penalty in GR populations. Therefore, while non-herbicidal management practices alone may have limited effectiveness on FTR, crop competition can significantly suppress the growth and seed production of both GR and GS populations. According to the principal component analysis, all populations exhibited higher growth and seed production in the absence of Gatton panic.</p>

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No Detectable Fitness Penalty of Glyphosate Resistance in Feathertop Rhodes Grass (Chloris virgata)

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Alireza Hasanfard,
  • Bhagirath Singh Chauhan

摘要

The spread of glyphosate resistance in feathertop Rhodes grass (FTR) (Chloris virgata Sw.) is a significant concern in Australian pastures and crop fields, requiring the evaluation of alternative strategies for managing this weed. In this study, we assessed the growth and seed production of six glyphosate-resistant (GR) and six glyphosate-susceptible (GS) populations of FTR in the presence and absence of interference from Gatton panic (Megathyrsus maximus) pasture plants. The presence of Gatton panic resulted in more than an 85% decrease in productivity-related parameters, including leaf number, dry matter, panicle number, and seed production, in both GR and GS FTR populations. No significant differences were observed between GR and GS populations, indicating no fitness penalty in GR populations. Therefore, while non-herbicidal management practices alone may have limited effectiveness on FTR, crop competition can significantly suppress the growth and seed production of both GR and GS populations. According to the principal component analysis, all populations exhibited higher growth and seed production in the absence of Gatton panic.