Serveur d'exploration Phytophthora

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Activity and Resistance Assessment of a New OSBP Inhibitor, R034-1, in Phytophthora capsici and the Detection of Point Mutations in PcORP1 that Confer Resistance.

Identifieur interne : 000309 ( Main/Exploration ); précédent : 000308; suivant : 000310

Activity and Resistance Assessment of a New OSBP Inhibitor, R034-1, in Phytophthora capsici and the Detection of Point Mutations in PcORP1 that Confer Resistance.

Auteurs : Dong Lin [République populaire de Chine] ; Zhaolin Xue [République populaire de Chine] ; Jianqiang Miao [République populaire de Chine] ; Zhongqiao Huang [République populaire de Chine] ; Xili Liu [République populaire de Chine]

Source :

RBID : pubmed:33191734

Abstract

R034-1 is a new member of the piperidinyl thiazole isoxazoline class of fungicides that shows high activity against most plant-pathogenic oomycetes and could effectively inhibit several developmental stages of Phytophthora capsici. Here, the potential resistance risk for R034-1 was evaluated in P. capsici. The baseline sensitivities of 135 isolates to R034-1 showed a unimodal curve, with a mean EC50 value of 0.004 μg/mL. Twelve resistant mutants were generated by fungicide adaptation and displayed lower fitness compared to parental isolates, which suggests that the resistance risk of P. capsici to R034-1 is low. R034-1 and oxathiapiprolin are structurally related, and resistant isolates display cross-resistance to both compounds, suggesting that these fungicides may target the same oxysterol binding protein. Comparison of PcORP1 genes in the resistant mutants and their parental isolates revealed (N767S, N767I, and G700V) amino acid substitutions in the R034-1 resistant mutant. Causality was functionally validated using site-directed mutagenesis of the target gene using the CRISPR/Cas9 system.

DOI: 10.1021/acs.jafc.0c05531
PubMed: 33191734


Affiliations:


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Le document en format XML

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<i>Phytophthora capsici</i>
. Here, the potential resistance risk for R034-1 was evaluated in
<i>P. capsici</i>
. The baseline sensitivities of 135 isolates to R034-1 showed a unimodal curve, with a mean EC
<sub>50</sub>
value of 0.004 μg/mL. Twelve resistant mutants were generated by fungicide adaptation and displayed lower fitness compared to parental isolates, which suggests that the resistance risk of
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to R034-1 is low. R034-1 and oxathiapiprolin are structurally related, and resistant isolates display cross-resistance to both compounds, suggesting that these fungicides may target the same oxysterol binding protein. Comparison of
<i>PcORP1</i>
genes in the resistant mutants and their parental isolates revealed (N767S, N767I, and G700V) amino acid substitutions in the R034-1 resistant mutant. Causality was functionally validated using site-directed mutagenesis of the target gene using the CRISPR/Cas9 system.</div>
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. Here, the potential resistance risk for R034-1 was evaluated in
<i>P. capsici</i>
. The baseline sensitivities of 135 isolates to R034-1 showed a unimodal curve, with a mean EC
<sub>50</sub>
value of 0.004 μg/mL. Twelve resistant mutants were generated by fungicide adaptation and displayed lower fitness compared to parental isolates, which suggests that the resistance risk of
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to R034-1 is low. R034-1 and oxathiapiprolin are structurally related, and resistant isolates display cross-resistance to both compounds, suggesting that these fungicides may target the same oxysterol binding protein. Comparison of
<i>PcORP1</i>
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