Baseline sensitivity and resistance-risk assessment of Phytophthora capsici to iprovalicarb.
Identifieur interne : 001824 ( Main/Corpus ); précédent : 001823; suivant : 001825Baseline sensitivity and resistance-risk assessment of Phytophthora capsici to iprovalicarb.
Auteurs : Xiao Hong Lu ; Shu Sheng Zhu ; Yang Bi ; Xi Li Liu ; Jianjun J. HaoSource :
- Phytopathology [ 0031-949X ] ; 2010.
English descriptors
- KwdEn :
- MESH :
- chemical , analogs & derivatives : Valine.
- chemical , pharmacology : Carbamates, Fungicides, Industrial, Valine.
- drug effects : Phytophthora.
- Drug Resistance, Fungal.
Abstract
Iprovalicarb has been used to control Phytophthora capsici, a devastating pathogen of many economically important crops. To evaluate the risk of fungicide resistance, 158 isolates of P. capsici were examined for sensitivity to iprovalicarb by measuring mycelial growth. Values of effective concentrations for 50% mycelial growth inhibition varied from 0.2042 to 0.5540 μg/ml and averaged 0.3923 (±0.0552) μg/ml, with a unimodal distribution. This is the first report of P. capsici isolates highly resistant to iprovalicarb (resistance factor >100). Resistance of the isolates was stable through 10 transfers on iprovalicarb-free medium, and most resistant isolates had the same level of fitness (mycelial growth, zoospore production, and virulence) as their corresponding parents, indicating that iprovalicarb resistance was independent from other general growth characters. There was cross-resistance among all tested carboxylic acid amide (CAA) fungicides, including iprovalicarb, flumorph, dimethomorph, and mandipropamid, but not with non-CAA fungicides, including azoxystrobin, chlorothalonil, cymoxanil, etridiazole, metalaxyl, and zoxamide. Based on the present results, resistance risk of P. capsici to CAAs could be moderate and resistance management should be considered.
DOI: 10.1094/PHYTO-12-09-0351
PubMed: 20932164
Links to Exploration step
pubmed:20932164Le document en format XML
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<author><name sortKey="Lu, Xiao Hong" sort="Lu, Xiao Hong" uniqKey="Lu X" first="Xiao Hong" last="Lu">Xiao Hong Lu</name>
<affiliation><nlm:affiliation>Department of Plant Pathology, China Agricultural University, Beijing, China.</nlm:affiliation>
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<author><name sortKey="Zhu, Shu Sheng" sort="Zhu, Shu Sheng" uniqKey="Zhu S" first="Shu Sheng" last="Zhu">Shu Sheng Zhu</name>
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<author><name sortKey="Bi, Yang" sort="Bi, Yang" uniqKey="Bi Y" first="Yang" last="Bi">Yang Bi</name>
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<author><name sortKey="Liu, Xi Li" sort="Liu, Xi Li" uniqKey="Liu X" first="Xi Li" last="Liu">Xi Li Liu</name>
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<author><name sortKey="Hao, Jianjun J" sort="Hao, Jianjun J" uniqKey="Hao J" first="Jianjun J" last="Hao">Jianjun J. Hao</name>
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<author><name sortKey="Liu, Xi Li" sort="Liu, Xi Li" uniqKey="Liu X" first="Xi Li" last="Liu">Xi Li Liu</name>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Carbamates (pharmacology)</term>
<term>Drug Resistance, Fungal (MeSH)</term>
<term>Fungicides, Industrial (pharmacology)</term>
<term>Phytophthora (drug effects)</term>
<term>Valine (analogs & derivatives)</term>
<term>Valine (pharmacology)</term>
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<front><div type="abstract" xml:lang="en">Iprovalicarb has been used to control Phytophthora capsici, a devastating pathogen of many economically important crops. To evaluate the risk of fungicide resistance, 158 isolates of P. capsici were examined for sensitivity to iprovalicarb by measuring mycelial growth. Values of effective concentrations for 50% mycelial growth inhibition varied from 0.2042 to 0.5540 μg/ml and averaged 0.3923 (±0.0552) μg/ml, with a unimodal distribution. This is the first report of P. capsici isolates highly resistant to iprovalicarb (resistance factor >100). Resistance of the isolates was stable through 10 transfers on iprovalicarb-free medium, and most resistant isolates had the same level of fitness (mycelial growth, zoospore production, and virulence) as their corresponding parents, indicating that iprovalicarb resistance was independent from other general growth characters. There was cross-resistance among all tested carboxylic acid amide (CAA) fungicides, including iprovalicarb, flumorph, dimethomorph, and mandipropamid, but not with non-CAA fungicides, including azoxystrobin, chlorothalonil, cymoxanil, etridiazole, metalaxyl, and zoxamide. Based on the present results, resistance risk of P. capsici to CAAs could be moderate and resistance management should be considered.</div>
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<Abstract><AbstractText>Iprovalicarb has been used to control Phytophthora capsici, a devastating pathogen of many economically important crops. To evaluate the risk of fungicide resistance, 158 isolates of P. capsici were examined for sensitivity to iprovalicarb by measuring mycelial growth. Values of effective concentrations for 50% mycelial growth inhibition varied from 0.2042 to 0.5540 μg/ml and averaged 0.3923 (±0.0552) μg/ml, with a unimodal distribution. This is the first report of P. capsici isolates highly resistant to iprovalicarb (resistance factor >100). Resistance of the isolates was stable through 10 transfers on iprovalicarb-free medium, and most resistant isolates had the same level of fitness (mycelial growth, zoospore production, and virulence) as their corresponding parents, indicating that iprovalicarb resistance was independent from other general growth characters. There was cross-resistance among all tested carboxylic acid amide (CAA) fungicides, including iprovalicarb, flumorph, dimethomorph, and mandipropamid, but not with non-CAA fungicides, including azoxystrobin, chlorothalonil, cymoxanil, etridiazole, metalaxyl, and zoxamide. Based on the present results, resistance risk of P. capsici to CAAs could be moderate and resistance management should be considered.</AbstractText>
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