Mode of Action of a Novel Synthetic Auxin Herbicide Halauxifen-Methyl
Jiaqi Xu | Xudong Liu | Richard Napier | Liyao Dong | Jun Li
Halauxifen-methyl is a new auxin herbicide developed by Corteva Agriscience (Wilmington, DE, USA). It has been suggested that <i>ABF5</i> may be the target of halauxifen-methyl, as <i>AFB5</i> mutants of <i>Arabidopsis thaliana</i> are resistant to halauxifen-methyl, which preferentially binds to <i>AFB5</i>. However, the mode of action of halauxifen-methyl has not yet been reported. Therefore, the aim of the present study was to reveal the mode of action of halauxifen-methyl by exploring its influence on indole-3-acetic acid (IAA) homeostasis and the biosynthesis of ethylene and Abscisic Acid (ABA) in <i>Galium aparine</i>. The results showed that halauxifen-methyl could disrupt the homeostasis of IAA and stimulate the overproduction of ethylene and ABA by inducing the overexpression of the 1-aminocyclopropane-1-carboxylate synthase (<i>ACS</i>) and 9-cis-epoxycarotenoid dioxygenase (<i>NCED</i>) genes involved in ethylene and ABA biosynthesis, finally leading to senescence and plant death.
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