Fitness and competitive ability of field isolates of Phytophthora capsici resistant or sensitive to fluopicolide.
Identifieur interne : 000198 ( Main/Exploration ); précédent : 000197; suivant : 000199Fitness and competitive ability of field isolates of Phytophthora capsici resistant or sensitive to fluopicolide.
Auteurs : Li Wang [États-Unis] ; Pingsheng Ji [États-Unis]Source :
- Plant disease [ 0191-2917 ] ; 2020.
Abstract
Phytophthora blight, caused by Phytophthora capsici, is one of the most destructive diseases in the production of solanaceous and cucurbitaceous vegetable crops. Fluopicolide has been used to control the disease; however, reduced efficacy of the fungicide was observed in Georgia. P. capsici isolates were collected from commercial vegetable fields in Georgia in 2018 and 2019 to determine sensitivity to fluopicolide, which were phenotyped to have 43.1% of the isolates as resistant. The fitness of resistant (R) and sensitive (S) isolates was assessed through mycelial growth and sporulation assays exposed to the fungicide (0 or 50 µg/ml). Fluopicolide did not reduce mycelial growth, sporangial production and zoospore germination of the resistant isolates. In the absence of fluopicolide, there was no significant difference between the R and S isolates in sporangial production, but mycelial growth and zoospore germination of the R isolates was greater than the S isolates (P = 0.01 and 0.001, respectively). The R isolates had similar ability as S isolates to induce disease on 'Aristotle' bell pepper, and most of the R and S isolates caused the same level of disease on 'Paladin'. Inoculating squash fruit using different R:S ratios and recovering R and S isolates after 5 cycles of inoculation resulted in similar trends in changes of R vs. S isolates ratios. Overall it appeared that fitness and competitive ability of the R isolates were not reduced compared to the S isolates. This is the first report of the occurrence of field isolates of P. capsici resistant to fluopicolide in the world. The results have significant implications in providing guidance for growers to avoid or limit use of this fungicide in vegetable production.
DOI: 10.1094/PDIS-08-20-1729-RE
PubMed: 33151816
Affiliations:
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Fluopicolide has been used to control the disease; however, reduced efficacy of the fungicide was observed in Georgia. <i>P. capsici</i> isolates were collected from commercial vegetable fields in Georgia in 2018 and 2019 to determine sensitivity to fluopicolide, which were phenotyped to have 43.1% of the isolates as resistant. The fitness of resistant (R) and sensitive (S) isolates was assessed through mycelial growth and sporulation assays exposed to the fungicide (0 or 50 µg/ml). Fluopicolide did not reduce mycelial growth, sporangial production and zoospore germination of the resistant isolates. In the absence of fluopicolide, there was no significant difference between the R and S isolates in sporangial production, but mycelial growth and zoospore germination of the R isolates was greater than the S isolates (<i>P</i> = 0.01 and 0.001, respectively). The R isolates had similar ability as S isolates to induce disease on 'Aristotle' bell pepper, and most of the R and S isolates caused the same level of disease on 'Paladin'. Inoculating squash fruit using different R:S ratios and recovering R and S isolates after 5 cycles of inoculation resulted in similar trends in changes of R vs. S isolates ratios. Overall it appeared that fitness and competitive ability of the R isolates were not reduced compared to the S isolates. This is the first report of the occurrence of field isolates of <i>P. capsici</i> resistant to fluopicolide in the world. The results have significant implications in providing guidance for growers to avoid or limit use of this fungicide in vegetable production.</div></front></TEI><pubmed><MedlineCitation Status="Publisher" Owner="NLM"><PMID Version="1">33151816</PMID><DateRevised><Year>2020</Year><Month>11</Month><Day>05</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0191-2917</ISSN><JournalIssue CitedMedium="Print"><PubDate><Year>2020</Year><Month>Nov</Month><Day>05</Day></PubDate></JournalIssue><Title>Plant disease</Title><ISOAbbreviation>Plant Dis</ISOAbbreviation></Journal><ArticleTitle>Fitness and competitive ability of field isolates of <i>Phytophthora capsici</i> resistant or sensitive to fluopicolide.</ArticleTitle><ELocationID EIdType="doi" ValidYN="Y">10.1094/PDIS-08-20-1729-RE</ELocationID><Abstract><AbstractText>Phytophthora blight, caused by <i>Phytophthora capsici</i>, is one of the most destructive diseases in the production of solanaceous and cucurbitaceous vegetable crops. Fluopicolide has been used to control the disease; however, reduced efficacy of the fungicide was observed in Georgia. <i>P. capsici</i> isolates were collected from commercial vegetable fields in Georgia in 2018 and 2019 to determine sensitivity to fluopicolide, which were phenotyped to have 43.1% of the isolates as resistant. The fitness of resistant (R) and sensitive (S) isolates was assessed through mycelial growth and sporulation assays exposed to the fungicide (0 or 50 µg/ml). Fluopicolide did not reduce mycelial growth, sporangial production and zoospore germination of the resistant isolates. In the absence of fluopicolide, there was no significant difference between the R and S isolates in sporangial production, but mycelial growth and zoospore germination of the R isolates was greater than the S isolates (<i>P</i> = 0.01 and 0.001, respectively). The R isolates had similar ability as S isolates to induce disease on 'Aristotle' bell pepper, and most of the R and S isolates caused the same level of disease on 'Paladin'. Inoculating squash fruit using different R:S ratios and recovering R and S isolates after 5 cycles of inoculation resulted in similar trends in changes of R vs. S isolates ratios. Overall it appeared that fitness and competitive ability of the R isolates were not reduced compared to the S isolates. This is the first report of the occurrence of field isolates of <i>P. capsici</i> resistant to fluopicolide in the world. The results have significant implications in providing guidance for growers to avoid or limit use of this fungicide in vegetable production.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Wang</LastName><ForeName>Li</ForeName><Initials>L</Initials><AffiliationInfo><Affiliation>Univ of Georgia, Coastal Plain Experiment Station, Tifton, Georgia, United States; li.wang1@uga.edu.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Ji</LastName><ForeName>Pingsheng</ForeName><Initials>P</Initials><AffiliationInfo><Affiliation>Univ of Georgia, Coastal Plain Experiment Station, 171 Plant Science Bldg, Tifton, Georgia, United States, 31793; pji@uga.edu.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2020</Year><Month>11</Month><Day>05</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Plant Dis</MedlineTA><NlmUniqueID>9882809</NlmUniqueID><ISSNLinking>0191-2917</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">Phytophthora</Keyword><Keyword MajorTopicYN="N">fungicide resistance</Keyword><Keyword MajorTopicYN="N">vegetable</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="entrez"><Year>2020</Year><Month>11</Month><Day>5</Day><Hour>17</Hour><Minute>12</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2020</Year><Month>11</Month><Day>6</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2020</Year><Month>11</Month><Day>6</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>aheadofprint</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">33151816</ArticleId><ArticleId IdType="doi">10.1094/PDIS-08-20-1729-RE</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>États-Unis</li></country><region><li>Géorgie (États-Unis)</li></region></list><tree><country name="États-Unis"><region name="Géorgie (États-Unis)"><name sortKey="Wang, Li" sort="Wang, Li" uniqKey="Wang L" first="Li" last="Wang">Li Wang</name></region><name sortKey="Ji, Pingsheng" sort="Ji, Pingsheng" uniqKey="Ji P" first="Pingsheng" last="Ji">Pingsheng Ji</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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