Thermal Inactivation of Inoculum of Two Phytophthora Species by Intermittent Versus Constant Heat.
Identifieur interne : 000638 ( Main/Exploration ); précédent : 000637; suivant : 000639Thermal Inactivation of Inoculum of Two Phytophthora Species by Intermittent Versus Constant Heat.
Auteurs : Fumiaki Funahashi ; Jennifer L. ParkeSource :
- Phytopathology [ 0031-949X ] ; 2018.
Descripteurs français
- KwdFr :
- MESH :
- microbiologie : Feuilles de plante, Rhododendron.
- physiologie : Phytophthora.
- Température élevée.
English descriptors
- KwdEn :
- MESH :
- microbiology : Plant Leaves, Rhododendron.
- physiology : Phytophthora.
- Hot Temperature.
Abstract
Research on solarization efficacy has examined the critical temperature and minimum exposure time to inactivate soilborne pathogens. Most mathematical models focus on survival of inoculum subjected to a constant heat regime rather than an intermittent heat regime that better simulates field conditions. To develop a more accurate predictive model, we conducted controlled lab experiments with rhododendron leaf disks infested with Phytophthora ramorum and P. pini. Focused in vitro experiments with P. ramorum showed significantly longer survival of inoculum exposed to intermittent versus constant heat, indicating that intermittent heat is less damaging. A similar trend was observed in soil. Damage was evaluated by comparing the reduction in subsequent survival time of inoculum subjected to different intensities of sublethal heat treatments. Inoculum exposure to continuous heat reflected an increasing rate of damage accumulation. Multiple sublethal heat events resulted in a constant rate of damage accumulation which allowed us to calculate total damage as the sum of damage from each heat event. A model including a correction for an intermittent heat regime significantly improved the prediction of thermal inactivation under a temperature regime that simulated field conditions.
DOI: 10.1094/PHYTO-06-17-0205-R
PubMed: 29384447
Affiliations:
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Parke</name><affiliation><nlm:affiliation>Department of Crop and Soil Science, Oregon State University, Corvallis 97331.</nlm:affiliation><wicri:noCountry code="subField">Corvallis 97331</wicri:noCountry></affiliation></author></analytic><series><title level="j">Phytopathology</title><idno type="ISSN">0031-949X</idno><imprint><date when="2018" type="published">2018</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Hot Temperature (MeSH)</term><term>Phytophthora (physiology)</term><term>Plant Leaves (microbiology)</term><term>Rhododendron (microbiology)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Feuilles de plante (microbiologie)</term><term>Phytophthora (physiologie)</term><term>Rhododendron (microbiologie)</term><term>Température élevée (MeSH)</term></keywords><keywords scheme="MESH" qualifier="microbiologie" xml:lang="fr"><term>Feuilles de plante</term><term>Rhododendron</term></keywords><keywords scheme="MESH" qualifier="microbiology" xml:lang="en"><term>Plant Leaves</term><term>Rhododendron</term></keywords><keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Phytophthora</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Phytophthora</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Hot Temperature</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Température élevée</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Research on solarization efficacy has examined the critical temperature and minimum exposure time to inactivate soilborne pathogens. Most mathematical models focus on survival of inoculum subjected to a constant heat regime rather than an intermittent heat regime that better simulates field conditions. To develop a more accurate predictive model, we conducted controlled lab experiments with rhododendron leaf disks infested with Phytophthora ramorum and P. pini. Focused in vitro experiments with P. ramorum showed significantly longer survival of inoculum exposed to intermittent versus constant heat, indicating that intermittent heat is less damaging. A similar trend was observed in soil. Damage was evaluated by comparing the reduction in subsequent survival time of inoculum subjected to different intensities of sublethal heat treatments. Inoculum exposure to continuous heat reflected an increasing rate of damage accumulation. Multiple sublethal heat events resulted in a constant rate of damage accumulation which allowed us to calculate total damage as the sum of damage from each heat event. A model including a correction for an intermittent heat regime significantly improved the prediction of thermal inactivation under a temperature regime that simulated field conditions.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">29384447</PMID><DateCompleted><Year>2018</Year><Month>08</Month><Day>22</Day></DateCompleted><DateRevised><Year>2018</Year><Month>08</Month><Day>22</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0031-949X</ISSN><JournalIssue CitedMedium="Print"><Volume>108</Volume><Issue>7</Issue><PubDate><Year>2018</Year><Month>Jul</Month></PubDate></JournalIssue><Title>Phytopathology</Title><ISOAbbreviation>Phytopathology</ISOAbbreviation></Journal><ArticleTitle>Thermal Inactivation of Inoculum of Two Phytophthora Species by Intermittent Versus Constant Heat.</ArticleTitle><Pagination><MedlinePgn>829-836</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1094/PHYTO-06-17-0205-R</ELocationID><Abstract><AbstractText>Research on solarization efficacy has examined the critical temperature and minimum exposure time to inactivate soilborne pathogens. Most mathematical models focus on survival of inoculum subjected to a constant heat regime rather than an intermittent heat regime that better simulates field conditions. To develop a more accurate predictive model, we conducted controlled lab experiments with rhododendron leaf disks infested with Phytophthora ramorum and P. pini. Focused in vitro experiments with P. ramorum showed significantly longer survival of inoculum exposed to intermittent versus constant heat, indicating that intermittent heat is less damaging. A similar trend was observed in soil. Damage was evaluated by comparing the reduction in subsequent survival time of inoculum subjected to different intensities of sublethal heat treatments. Inoculum exposure to continuous heat reflected an increasing rate of damage accumulation. Multiple sublethal heat events resulted in a constant rate of damage accumulation which allowed us to calculate total damage as the sum of damage from each heat event. A model including a correction for an intermittent heat regime significantly improved the prediction of thermal inactivation under a temperature regime that simulated field conditions.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Funahashi</LastName><ForeName>Fumiaki</ForeName><Initials>F</Initials><AffiliationInfo><Affiliation>Department of Crop and Soil Science, Oregon State University, Corvallis 97331.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Parke</LastName><ForeName>Jennifer L</ForeName><Initials>JL</Initials><AffiliationInfo><Affiliation>Department of Crop and Soil Science, Oregon State University, Corvallis 97331.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2018</Year><Month>05</Month><Day>14</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Phytopathology</MedlineTA><NlmUniqueID>9427222</NlmUniqueID><ISSNLinking>0031-949X</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D006358" MajorTopicYN="Y">Hot Temperature</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D010838" MajorTopicYN="N">Phytophthora</DescriptorName><QualifierName UI="Q000502" MajorTopicYN="Y">physiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D018515" MajorTopicYN="N">Plant Leaves</DescriptorName><QualifierName UI="Q000382" MajorTopicYN="N">microbiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D029793" MajorTopicYN="N">Rhododendron</DescriptorName><QualifierName UI="Q000382" MajorTopicYN="N">microbiology</QualifierName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>2018</Year><Month>2</Month><Day>1</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2018</Year><Month>8</Month><Day>23</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2018</Year><Month>2</Month><Day>1</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">29384447</ArticleId><ArticleId IdType="doi">10.1094/PHYTO-06-17-0205-R</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list></list><tree><noCountry><name sortKey="Funahashi, Fumiaki" sort="Funahashi, Fumiaki" uniqKey="Funahashi F" first="Fumiaki" last="Funahashi">Fumiaki Funahashi</name><name sortKey="Parke, Jennifer L" sort="Parke, Jennifer L" uniqKey="Parke J" first="Jennifer L" last="Parke">Jennifer L. 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