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Assessment of Efficacy and Mechanism of Resistance to Soil-Applied PPO Inhibitors in Amaranthus palmeri = Evaluación de la eficacia y el mecanismo de resistencia a los inhibidores de PPO aplicados al suelo en Amaranthus palmeri

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Año de publicación 2023
Idioma Inglés
Publicado por Agronomy

Descripción: Abstract: Resistance to protoporphyrinogen oxidase (PPO) inhibitors in Palmer amaranth is a majorconcern, given the high selection pressure and increasing number of populations with reducedsensitivity to PPO herbicides in the US. We evaluated the effect of five soil-applied herbicides onPalmer amaranth (Amaranthus palmeriS. Wats.) populations collected in 2014 and 2015 in Arkansas,USA. Soil-applied saflufenacil, sulfentrazone, and flumioxazin reduced the seedling emergence 91–100%; however, fomesafen and oxyfluorfen showed reduced (63–90%) efficacy on some populations.Target-site mutation (TSM) is the major mechanism of resistance to PPO herbicides; therefore, sixpopulations showing resistance to soil-applied fomesafen were selected for molecular investigations.A total of 81 survivors were genotyped for all known resistance-conferring mutations. A total of 64%and 36% survivors had single and double TSMs, respectively, with 69% of plants carrying TSM inboth alleles ofPPO2. Three survivors from two populations showed an additional copy ofPPO2,whereas all other survivors had one copy. Expression analysis showed 3- to 6-fold upregulation ofPPO2in all plants from resistant populations tested. Transgenic overexpression of WT-ApPPO2anddG210-Apppo2inA. thalianaconfirmed the reduced sensitivity to soil-applied fomesafen compared tothe wild type. Collectively, PPO inhibitors applied pre-emergence are still effective in controllingpopulations resistant to foliar-applied PPO herbicides. Mechanically, elevated expression of resistantPPO2, alongside functional TSM, contribute to reduced sensitivity to soilapplied fomesafen.
Citación recomendada (normas APA)
: Gulab; Porri Rangani, "Assessment of Efficacy and Mechanism of Resistance to Soil-Applied PPO Inhibitors in Amaranthus palmeri = Evaluación de la eficacia y el mecanismo de resistencia a los inhibidores de PPO aplicados al suelo en Amaranthus palmeri", Colombia:Agronomy, 2023. Consultado en línea en la Biblioteca Digital de Bogotá (https://www.bibliotecadigitaldebogota.gov.co/resources/3712000/), el día 2025-05-02.

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Derechos de uso Derechos reservados
Fuente Biblioteca Virtual Banco de la República
Términos y condiciones de uso Más información aquí
Año de publicación 2023
Formato PDF
Cobertura Colombia

Assessment of Efficacy and Mechanism of Resistance to Soil-Applied PPO Inhibitors in Amaranthus palmeri = Evaluación de la eficacia y el mecanismo de resistencia a los inhibidores de PPO aplicados al suelo en Amaranthus palmeri

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