The combination of auxin and paraquat produces an additive effect on leaf bleaching but an antagonistic effect on root branching
2025
Jia Song | Zitong Li | Suxin Li | Chao Tan | Deyi Shao | Muhammad Arif | Ying-Ming Zhang | Qiang Bian | Shuzhen Men
Auxin is a pivotal hormone that regulates plant growth and development; however, excessive levels can inhibit growth, making auxin analogs valuable as herbicides. Paraquat, a synthetic organic herbicide, has been widely used in agricultural weed control. While previous studies have largely examined the individual effects of auxinic herbicides or paraquat on weeds, the combined application of auxin and paraquat remains unexplored. This study investigates the combined effects of auxin and paraquat on the growth of Arabidopsis thaliana seedlings. The results reveal that paraquat and auxin have antagonistic effects on hypocotyl elongation, root thickening, and lateral root formation in Arabidopsis seedlings, while they have additive effects on cotyledon bleaching. Further analyses indicate that paraquat inhibits the expression of polar auxin transport and auxin signaling pathway genes. These findings provide a basis for elucidating the interaction mechanism between auxin and paraquat, which may help to optimize weed management strategies in agriculture.
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