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ACCERBATIN, a small molecule at the intersection of auxin and reactive oxygen species homeostasis with herbicidal properties

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    0479102 - ÚEB 2018 RIV GB eng J - Journal Article
    Hu, Y. - Depaepe, T. - Smet, D. - Hoyerová, Klára - Klíma, Petr - Cuypers, J. - Cutler, S. - Buyst, D. - Morreel, K. - Boerjan, W. - Martins, J. - Petrášek, Jan - Vandenbussche, F. - Van Der Straeten, D.
    ACCERBATIN, a small molecule at the intersection of auxin and reactive oxygen species homeostasis with herbicidal properties.
    Journal of Experimental Botany. Roč. 68, č. 15 (2017), s. 4185-4203. ISSN 0022-0957. E-ISSN 1460-2431
    R&D Projects: GA MŠk LD15137
    Institutional support: RVO:61389030
    Keywords : apical hook development * root hair development * arabidopsis-thaliana seedlings * ethylene biosynthesis * shoot gravitropism * cell elongation * abiotic stress * abscisic-acid * plant-growth * gene family * Arabidopsis * auxin homeostasis * chemical genetics * ethylene signaling * herbicide * quinoline carboxamide * reactive oxygen species * triple response
    Subject RIV: EA - Cell Biology
    OBOR OECD: Plant sciences, botany
    Impact factor: 5.354, year: 2017

    The volatile two-carbon hormone ethylene acts in concert with an array of signals to affect etiolated seedling development. From a chemical screen, we isolated a quinoline carboxamide designated ACCERBATIN (AEX) that exacerbates the 1-aminocyclopropane-1-carboxylic acid-induced triple response, typical for ethylene-treated seedlings in darkness. Phenotypic analyses revealed distinct AEX effects including inhibition of root hair development and shortening of the root meristem. Mutant analysis and reporter studies further suggested that AEX most probably acts in parallel to ethylene signaling. We demonstrated that AEX functions at the intersection of auxin metabolism and reactive oxygen species (ROS) homeostasis. AEX inhibited auxin efflux in BY-2 cells and promoted indole-3-acetic acid (IAA) oxidation in the shoot apical meristem and cotyledons of etiolated seedlings. Gene expression studies and superoxide/hydrogen peroxide staining further revealed that the disrupted auxin homeostasis was accompanied by oxidative stress. Interestingly, in light conditions, AEX exhibited properties reminiscent of the quinoline carboxylate-type auxin-like herbicides. We propose that AEX interferes with auxin transport from its major biosynthesis sites, either as a direct consequence of poor basipetal transport from the shoot meristematic region, or indirectly, through excessive IAA oxidation and ROS accumulation. Further investigation of AEX can provide new insights into the mechanisms connecting auxin and ROS homeostasis in plant development and provide useful tools to study auxin-type herbicides.
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