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<p>The chloroacetamide herbicide S-metolachlor (MET) is widely employed in agriculture due to its high efficacy against weeds. However, its precise action mechanism remains incompletely elucidated. This study aimed to elucidate the phytotoxic effect of the chloroacetamide herbicide S-metolachlor (MET) on rice at the transcriptomic level. Bioassay results indicated that the fresh weight inhibition rate of rice ranged from 7.7% to 67.5% when the MET concentration ranged from 2.5 to 80&#xa0;mg/L. Transcriptome analysis revealed 629 differentially expressed genes (DEGs) that were significantly expressed upon MET treatment. Further validation revealed that the expression levels of five key DEGs, namely, <i>OsGA2OX3</i>, <i>OsMAS</i>, <i>OsERF-083</i>, <i>OsSAUR31</i>, and <i>OsOPR4</i>, were significantly positively correlated with the inhibition of rice fresh weight. These genes are involved in the biosynthesis or signal transduction pathways of gibberellin (GA), abscisic acid (ABA), ethylene (ETH), indole-3-acetic acid (IAA), and jasmonic acid (JA), respectively. The abnormal expression of these genes may be a key factor contributing to MET-induced phytotoxicity in rice.</p>

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Transcriptome Analysis Candidate Genes Associated with Hormone Biosynthesis and Metabolism in Rice Exposed to S-metolachlor Phytotoxicity

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Bojing He,
  • Haitao Gao,
  • Lanlan Sun,
  • Hongle Xu,
  • Wangcang Su,
  • Fei Xue,
  • Qinghao Liu,
  • Renhai Wu

摘要

The chloroacetamide herbicide S-metolachlor (MET) is widely employed in agriculture due to its high efficacy against weeds. However, its precise action mechanism remains incompletely elucidated. This study aimed to elucidate the phytotoxic effect of the chloroacetamide herbicide S-metolachlor (MET) on rice at the transcriptomic level. Bioassay results indicated that the fresh weight inhibition rate of rice ranged from 7.7% to 67.5% when the MET concentration ranged from 2.5 to 80 mg/L. Transcriptome analysis revealed 629 differentially expressed genes (DEGs) that were significantly expressed upon MET treatment. Further validation revealed that the expression levels of five key DEGs, namely, OsGA2OX3, OsMAS, OsERF-083, OsSAUR31, and OsOPR4, were significantly positively correlated with the inhibition of rice fresh weight. These genes are involved in the biosynthesis or signal transduction pathways of gibberellin (GA), abscisic acid (ABA), ethylene (ETH), indole-3-acetic acid (IAA), and jasmonic acid (JA), respectively. The abnormal expression of these genes may be a key factor contributing to MET-induced phytotoxicity in rice.