Multiple Resistance to Synthetic Auxin Herbicides and Glyphosate in Parthenium hysterophorus Occurring in Citrus Orchards

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2019-08-15
Author
Mora, Andrés D.
Rosario, Jesús
Rojano-Delgado, Antonia M.
Palma-Bautista, Candelario
Torra Farré, Joel
Alcántara-de la Cruz, Ricardo
Prado, Rafael de
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Mora, Andrés D.; Rosario, Jesús; Rojano-Delgado, Antonia M.; Palma-Bautista, Candelario; Torra Farré, Joel; Alcántara-de la Cruz, Ricardo; Prado, Rafael de; . (2019) . Multiple Resistance to Synthetic Auxin Herbicides and Glyphosate in Parthenium hysterophorus Occurring in Citrus Orchards. Journal of Agricultural and Food Chemistry, 2019, vol. 67, num. 36, p. 10010-10017. https://doi.org/10.1021/acs.jafc.9b03988.
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Abstract
Dominican farmers have started to apply synthetic auxin herbicides (SAHs) as the main alternative to mitigate the impacts of the occurrence of glyphosate-resistant (GR) Parthenium hysterophorus populations in citrus orchards. A GR P. hysterophorus population survived field labeled rates of glyphosate,
2,4-dichlorophenoxyacetic acid (2,4-D), dicamba, and picloram, which showed poor control (<50%). In in vivo assays, resistance levels were high for glyphosate and moderate for picloram, dicamba, and 2,4-D. Sequencing the 5-enolpyruvylshikimate-3-phosphate synthase gene revealed the double Thr-102-Ile and Pro-106-Ser amino acid substitution, conferring resistance to glyphosate. Additionally, reduced absorption and impaired translocation contributed to this resistance. Regarding SAH, impaired 2,4-D transport and enhanced metabolism were confirmed in resistant plants. The application of malathion improved the efficacy of SAHs (control >50%), showing that metabolism of these herbicides was mediated by cytochrome P450 enzymes. This study reports, for the first time, multiple resistance to SAHs and glyphosate in P. hysterophorus.
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http://hdl.handle.net/10459.1/66698
DOI
https://doi.org/10.1021/acs.jafc.9b03988
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Journal of Agricultural and Food Chemistry, 2019, vol. 67, num. 36, p. 10010-10017
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