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New case of false‐Star‐Grass (Chloris distichophylla) population evolving glyphosate resistance

Agronomy, ISSN: 2073-4395, Vol: 10, Issue: 3
2020
  • 10
    Citations
  • 0
    Usage
  • 12
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    10
    • Citation Indexes
      10
  • Captures
    12

Article Description

Chloris distichophylla, suspected of glyphosate resistance (GR), was collected from areas of soybean cultivation in Rio Grande do Sul, Brazil. A comparison was made with a susceptible population (GS) to evaluate the resistance level, mechanisms involved, and control alternatives. Glyphosate doses required to reduce the dry weight (GR50) or cause a mortality rate of 50% (LD50) were around 5.1-3 times greater in the GR population than in the GS population. The shikimic acid accumulation was around 6.2‐fold greater in GS plants than in GR plants. No metabolized glyphosate was found in either GR or GS plants. Both populations did not differ in the enzyme 5‐enolpyruvylshikimate‐3‐phosphate synthase (EPSPS) basal activity or in vitro inhibition of EPSPS activity by glyphosate (I50). The maximum glyphosate absorption was observed at 96 hours after treatment (HAT), which was twofold higher in the GS plants than in the GR plants. This confirms the first case of glyphosate resistance in C. distichophylla. In addition, at 96 HAT, the GS plants translocated more C‐glyphosate than the GR ones. The best options for the chemical control of both C. distichophylla populations were clethodim, quizalofop, paraquat, glufosinate, tembotrione, diuron, and atrazine. The first case of glyphosate resistance in C. distichophylla was due to impaired uptake and translocation. Chemical control using multiple herbicides with different modes of action (MOA) could be a tool used for integrated weed management (IWM) programs.

Bibliographic Details

José G. Vázquez‐García; Candelario Palma‐Bautista; Antonia M. Rojano‐Delgado; Hugo E. Cruz‐Hipólito; Rafael de Prado; Sajedeh Golmohammadzadeh; José A. Domínguez‐Valenzuela

MDPI AG

Agricultural and Biological Sciences

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