Characteristics of Resistance to Phytophthora Root and Crown Rot in Cucurbita pepo.
Identifieur interne : 000A51 ( Main/Exploration ); précédent : 000A50; suivant : 000A52Characteristics of Resistance to Phytophthora Root and Crown Rot in Cucurbita pepo.
Auteurs : Charles S. Krasnow [États-Unis] ; Raymond Hammerschmidt [États-Unis] ; Mary K. Hausbeck [États-Unis]Source :
- Plant disease [ 0191-2917 ] ; 2017.
Abstract
Root and crown rot incited by Phytophthora capsici causes considerable annual losses in squash-producing regions in the United States. 'Spineless Perfection' zucchini and 'Cougar' straightneck squash (Cucurbita pepo L.), partially resistant and susceptible to root and crown rot, respectively, were investigated for differences in root and crown physical factors and the histology of crown infection by P. capsici. The pH and titratable acidity of healthy root and crown tissue from tissue extracts were not significantly different between cultivars (P = 0.05). Crude fiber content (%) of blended and oven-dried root and crown tissue from healthy plants was similar between cultivars. However, dry matter (%) was highest for Cougar (P = 0.05). Colonies of P. capsici grown from mycelial plugs in root exudates collected from each cultivar were similar in diameter. Whole mounts and histological sections of healthy and infected crown tissue revealed that vascular bundles and metaxylem vessels were more abundant in crowns of Spineless Perfection than Cougar. Twelve to 48 h post inoculation (hpi), mycelia in the crown of each cultivar was limited to the cortex and hypodermal tissue. By 72 hpi, hyphae were observed in the cortex and endodermal tissue of Cougar and were concentrated in the phloem and parenchyma cells surrounding vascular bundles. Mycelia were limited to the outer cortex in Spineless Perfection. Mycelia and occluding material were present in the majority of metaxylem vessels of Cougar but not Spineless Perfection at 92 hpi; dissolution of parenchyma cells surrounding vascular bundles was apparent in Cougar. The vascular occlusions observed in Cougar may be responsible for plant wilting, a common disease symptom. Additional straightneck, crookneck, scallop, and acorn squash (C. pepo ssp. ovifera), and zucchini, marrow, and pumpkin (C. pepo ssp. pepo) cultivars were evaluated in a greenhouse study for resistance to root and crown rot. Cucurbita pepo ssp. ovifera cultivars were significantly more susceptible than C. pepo ssp. pepo to root and crown rot (P < 0.0001). Growing C. pepo ssp. pepo cultivars may be beneficial in an integrated Phytophthora management program.
DOI: 10.1094/PDIS-06-16-0867-RE
PubMed: 30678567
Affiliations:
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Krasnow</name><affiliation wicri:level="4"><nlm:affiliation>Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing 48824.</nlm:affiliation><orgName type="university">Université d'État du Michigan</orgName><country>États-Unis</country><placeName><settlement type="city">East Lansing</settlement><region type="state">Michigan</region></placeName></affiliation></author><author><name sortKey="Hammerschmidt, Raymond" sort="Hammerschmidt, Raymond" uniqKey="Hammerschmidt R" first="Raymond" last="Hammerschmidt">Raymond Hammerschmidt</name><affiliation wicri:level="4"><nlm:affiliation>Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing 48824.</nlm:affiliation><orgName type="university">Université d'État du Michigan</orgName><country>États-Unis</country><placeName><settlement type="city">East Lansing</settlement><region type="state">Michigan</region></placeName></affiliation></author><author><name sortKey="Hausbeck, Mary K" sort="Hausbeck, Mary K" uniqKey="Hausbeck M" first="Mary K" last="Hausbeck">Mary K. Hausbeck</name><affiliation wicri:level="4"><nlm:affiliation>Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing 48824.</nlm:affiliation><orgName type="university">Université d'État du Michigan</orgName><country>États-Unis</country><placeName><settlement type="city">East Lansing</settlement><region type="state">Michigan</region></placeName></affiliation></author></analytic><series><title level="j">Plant disease</title><idno type="ISSN">0191-2917</idno><imprint><date when="2017" type="published">2017</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Root and crown rot incited by Phytophthora capsici causes considerable annual losses in squash-producing regions in the United States. 'Spineless Perfection' zucchini and 'Cougar' straightneck squash (Cucurbita pepo L.), partially resistant and susceptible to root and crown rot, respectively, were investigated for differences in root and crown physical factors and the histology of crown infection by P. capsici. The pH and titratable acidity of healthy root and crown tissue from tissue extracts were not significantly different between cultivars (P = 0.05). Crude fiber content (%) of blended and oven-dried root and crown tissue from healthy plants was similar between cultivars. However, dry matter (%) was highest for Cougar (P = 0.05). Colonies of P. capsici grown from mycelial plugs in root exudates collected from each cultivar were similar in diameter. Whole mounts and histological sections of healthy and infected crown tissue revealed that vascular bundles and metaxylem vessels were more abundant in crowns of Spineless Perfection than Cougar. Twelve to 48 h post inoculation (hpi), mycelia in the crown of each cultivar was limited to the cortex and hypodermal tissue. By 72 hpi, hyphae were observed in the cortex and endodermal tissue of Cougar and were concentrated in the phloem and parenchyma cells surrounding vascular bundles. Mycelia were limited to the outer cortex in Spineless Perfection. Mycelia and occluding material were present in the majority of metaxylem vessels of Cougar but not Spineless Perfection at 92 hpi; dissolution of parenchyma cells surrounding vascular bundles was apparent in Cougar. The vascular occlusions observed in Cougar may be responsible for plant wilting, a common disease symptom. Additional straightneck, crookneck, scallop, and acorn squash (C. pepo ssp. ovifera), and zucchini, marrow, and pumpkin (C. pepo ssp. pepo) cultivars were evaluated in a greenhouse study for resistance to root and crown rot. Cucurbita pepo ssp. ovifera cultivars were significantly more susceptible than C. pepo ssp. pepo to root and crown rot (P < 0.0001). Growing C. pepo ssp. pepo cultivars may be beneficial in an integrated Phytophthora management program.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">30678567</PMID><DateRevised><Year>2019</Year><Month>11</Month><Day>20</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0191-2917</ISSN><JournalIssue CitedMedium="Print"><Volume>101</Volume><Issue>5</Issue><PubDate><Year>2017</Year><Month>May</Month></PubDate></JournalIssue><Title>Plant disease</Title><ISOAbbreviation>Plant Dis</ISOAbbreviation></Journal><ArticleTitle>Characteristics of Resistance to Phytophthora Root and Crown Rot in Cucurbita pepo.</ArticleTitle><Pagination><MedlinePgn>659-665</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1094/PDIS-06-16-0867-RE</ELocationID><Abstract><AbstractText>Root and crown rot incited by Phytophthora capsici causes considerable annual losses in squash-producing regions in the United States. 'Spineless Perfection' zucchini and 'Cougar' straightneck squash (Cucurbita pepo L.), partially resistant and susceptible to root and crown rot, respectively, were investigated for differences in root and crown physical factors and the histology of crown infection by P. capsici. The pH and titratable acidity of healthy root and crown tissue from tissue extracts were not significantly different between cultivars (P = 0.05). Crude fiber content (%) of blended and oven-dried root and crown tissue from healthy plants was similar between cultivars. However, dry matter (%) was highest for Cougar (P = 0.05). Colonies of P. capsici grown from mycelial plugs in root exudates collected from each cultivar were similar in diameter. Whole mounts and histological sections of healthy and infected crown tissue revealed that vascular bundles and metaxylem vessels were more abundant in crowns of Spineless Perfection than Cougar. Twelve to 48 h post inoculation (hpi), mycelia in the crown of each cultivar was limited to the cortex and hypodermal tissue. By 72 hpi, hyphae were observed in the cortex and endodermal tissue of Cougar and were concentrated in the phloem and parenchyma cells surrounding vascular bundles. Mycelia were limited to the outer cortex in Spineless Perfection. Mycelia and occluding material were present in the majority of metaxylem vessels of Cougar but not Spineless Perfection at 92 hpi; dissolution of parenchyma cells surrounding vascular bundles was apparent in Cougar. The vascular occlusions observed in Cougar may be responsible for plant wilting, a common disease symptom. Additional straightneck, crookneck, scallop, and acorn squash (C. pepo ssp. ovifera), and zucchini, marrow, and pumpkin (C. pepo ssp. pepo) cultivars were evaluated in a greenhouse study for resistance to root and crown rot. Cucurbita pepo ssp. ovifera cultivars were significantly more susceptible than C. pepo ssp. pepo to root and crown rot (P < 0.0001). Growing C. pepo ssp. pepo cultivars may be beneficial in an integrated Phytophthora management program.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Krasnow</LastName><ForeName>Charles S</ForeName><Initials>CS</Initials><AffiliationInfo><Affiliation>Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing 48824.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Hammerschmidt</LastName><ForeName>Raymond</ForeName><Initials>R</Initials><AffiliationInfo><Affiliation>Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing 48824.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Hausbeck</LastName><ForeName>Mary K</ForeName><Initials>MK</Initials><AffiliationInfo><Affiliation>Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing 48824.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2017</Year><Month>03</Month><Day>14</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Plant Dis</MedlineTA><NlmUniqueID>9882809</NlmUniqueID><ISSNLinking>0191-2917</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="entrez"><Year>2019</Year><Month>1</Month><Day>26</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2017</Year><Month>5</Month><Day>1</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2017</Year><Month>5</Month><Day>1</Day><Hour>0</Hour><Minute>1</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">30678567</ArticleId><ArticleId IdType="doi">10.1094/PDIS-06-16-0867-RE</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>États-Unis</li></country><region><li>Michigan</li></region><settlement><li>East Lansing</li></settlement><orgName><li>Université d'État du Michigan</li></orgName></list><tree><country name="États-Unis"><region name="Michigan"><name sortKey="Krasnow, Charles S" sort="Krasnow, Charles S" uniqKey="Krasnow C" first="Charles S" last="Krasnow">Charles S. Krasnow</name></region><name sortKey="Hammerschmidt, Raymond" sort="Hammerschmidt, Raymond" uniqKey="Hammerschmidt R" first="Raymond" last="Hammerschmidt">Raymond Hammerschmidt</name><name sortKey="Hausbeck, Mary K" sort="Hausbeck, Mary K" uniqKey="Hausbeck M" first="Mary K" last="Hausbeck">Mary K. Hausbeck</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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