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- W3033990501 abstract "Abstract Wild poinsettia ( Euphorbia heterophylla L.) is a troublesome broadleaf weed in grain production areas in South America. Herbicide resistance to multiple sites of action has been documented in this species, including protoporphyrinogen oxidase (PPO) inhibitors. We investigated the physiological and molecular bases for PPO-inhibitor resistance in a E. heterophylla population (R PPO ) from Southern Brazil. Whole-plant dose–response experiments revealed a cross-resistance profile to three different chemical groups of PPO inhibitors. Based on dose–response parameters, R PPO was resistant to lactofen (47.7-fold), saflufenacil (8.6-fold), and pyraflufen-ethyl (3.5-fold). Twenty-four hours after lactofen treatment (120 g ha −1 ) POST, R PPO accumulated 27 times less protoporphyrin than the susceptible population (S PPO ). In addition, R PPO generated 5 and 4.5 times less hydrogen peroxide and superoxide than S PPO , respectively. The chloroplast PPO ( PPO1 ) sequences were identical between the two populations, whereas 35 single-nucleotide polymorphisms were found for the mitochondrial PPO ( PPO2 ). Based on protein homology modeling, the Arg-128-Leu (homologous to Arg-98-Leu in common ragweed [ Ambrosia artemisiifolia L.] was the only one located near the catalytic site, also in a conserved region of PPO2 . The cytochrome P450 monooxygenase inhibitor malathion did not reverse resistance to lactofen in R PPO , and both populations showed similar levels of PPO1 and PPO2 expression, suggesting that metabolic resistance and PPO overexpression are unlikely. This is the first report of an Arg-128-Leu mutation in PPO2 conferring cross-resistance to PPO inhibitors in E. heterophylla ." @default.
- W3033990501 created "2020-06-12" @default.
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- W3033990501 date "2020-06-02" @default.
- W3033990501 modified "2023-10-13" @default.
- W3033990501 title "Arg-128-Leu target-site mutation in <i>PPO2</i> evolves in wild poinsettia (<i>Euphorbia heterophylla</i>) with cross-resistance to PPO-inhibiting herbicides" @default.
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- W3033990501 doi "https://doi.org/10.1017/wsc.2020.42" @default.
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