Skip to main content

ORIGINAL RESEARCH article

Front. Plant Sci.
Sec. Plant Abiotic Stress
Volume 15 - 2024 | doi: 10.3389/fpls.2024.1424760

The Effects of Long-term Application of Fomesafen on Weed Seedbank and Resistance Levels of Amaranthus retroflexus L

Provisionally accepted
Xiaotong Guo Xiaotong Guo Yulian Guo Yulian Guo *Yu Wang Yu Wang *Chan Luo Chan Luo *Keqiang Cong Keqiang Cong *
  • Heilongjiang Academy of Agricultural Sciences, Harbin, China

The final, formatted version of the article will be published soon.

    Amaranthus retroflexus L. is one of the invasive malignant weeds in soybean fields. The diphenyl ether herbicides are commonly used to control weeds in soybean fields currently, among which fomesafen is the most widely used. With the long-term use of fomesafen, the weed species in soybean fields in multiple areas was declined, and the control effect of fomesafen against Amaranthus retroflexus was decreased significantly. The study aims to confirm the effects of long-term use of fomesafen on weed community richness and the current resistance level of Amaranthus retroflexus. In this paper, the result of seed germination indicated that the weed community richness was decreased significantly due to the long-term application of fomesafen, and the primary dominant weed was Amaranthus retroflexus. The result of the whole-plant bioassay denoted that Amaranthus retroflexus has developed the resistance to fomesafen, and resistance index was 50~59 g a.i. ha-1. The resistance level and mechanism of Amaranthus retroflexus were clarified by target gene detection, enzyme activity determination and gene expression analysis. The results performed that there were both target resistance with Arg128Gly mutation in PPX2 gene and non-target resistance (NTSR) with increased activity of metabolic enzyme (cytochromes P450 (P450s) and glutathione S-transferase (GSTs)) and protective enzyme (peroxidase (POD) and catalase (CAT)) in Amaranthus retroflexus.

    Keywords: Weed seedbank, Amaranthus retroflexus L., Fomesafen, Target resistance, Non-target resistance

    Received: 28 Apr 2024; Accepted: 17 Jul 2024.

    Copyright: © 2024 Guo, Guo, Wang, Luo and Cong. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence:
    Yulian Guo, Heilongjiang Academy of Agricultural Sciences, Harbin, China
    Yu Wang, Heilongjiang Academy of Agricultural Sciences, Harbin, China
    Chan Luo, Heilongjiang Academy of Agricultural Sciences, Harbin, China
    Keqiang Cong, Heilongjiang Academy of Agricultural Sciences, Harbin, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.