Molecular and morphological characterization of the willow rust fungus, Melampsora epitea, from arctic and temperate hosts in North America.
Identifieur interne : 000161 ( Main/Exploration ); précédent : 000160; suivant : 000162Molecular and morphological characterization of the willow rust fungus, Melampsora epitea, from arctic and temperate hosts in North America.
Auteurs : Jason A. Smith [États-Unis] ; Robert A. Blanchette ; George NewcombeSource :
- Mycologia [ 0027-5514 ]
Abstract
Current taxonomy places all rust fungi that occur on willow (Salix spp.) in North America in one species complex, Melampsora epitea Thüm. Characteristics of M. epitea isolates from the Canadian arctic were compared to M. epitea isolates from temperate regions of North America. Sequences from internal transcribed spacer (ITS) regions of rDNA were obtained from urediniospores from rust-infected Salix leaves collected in the Canadian arctic and in Minnesota and compared. Phylogenetic analysis of nuclear ribosomal ITS regions indicated that arctic M. epitea samples were divergent from temperate M. epitea isolates, perhaps in part because all rusts examined diverged according to host species. Four urediniospore characteristics were examined: area, circularity (shape factor), major axis length and spine density. Statistically significant (P < 0.05) differences were observed for spine density among all host species except S. nigra and S. bebbiana. However major axis length differed between these species. These results represent the first evidence that arctic and temperate Melampsora species on Salix hosts in North America have evolved distinct molecular and morphological characters.
PubMed: 21148956
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Smith</name><affiliation wicri:level="2"><nlm:affiliation>Department of Plant Pathology, University of Minnesota, St. Paul, Minnesota 55108.</nlm:affiliation><country xml:lang="fr">États-Unis</country><placeName><region type="state">Minnesota</region></placeName><wicri:cityArea>Department of Plant Pathology, University of Minnesota, St. Paul</wicri:cityArea></affiliation></author><author><name sortKey="Blanchette, Robert A" sort="Blanchette, Robert A" uniqKey="Blanchette R" first="Robert A" last="Blanchette">Robert A. Blanchette</name></author><author><name sortKey="Newcombe, George" sort="Newcombe, George" uniqKey="Newcombe G" first="George" last="Newcombe">George Newcombe</name></author></analytic><series><title level="j">Mycologia</title><idno type="ISSN">0027-5514</idno></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Current taxonomy places all rust fungi that occur on willow (Salix spp.) in North America in one species complex, Melampsora epitea Thüm. Characteristics of M. epitea isolates from the Canadian arctic were compared to M. epitea isolates from temperate regions of North America. Sequences from internal transcribed spacer (ITS) regions of rDNA were obtained from urediniospores from rust-infected Salix leaves collected in the Canadian arctic and in Minnesota and compared. Phylogenetic analysis of nuclear ribosomal ITS regions indicated that arctic M. epitea samples were divergent from temperate M. epitea isolates, perhaps in part because all rusts examined diverged according to host species. Four urediniospore characteristics were examined: area, circularity (shape factor), major axis length and spine density. Statistically significant (P < 0.05) differences were observed for spine density among all host species except S. nigra and S. bebbiana. However major axis length differed between these species. These results represent the first evidence that arctic and temperate Melampsora species on Salix hosts in North America have evolved distinct molecular and morphological characters.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">21148956</PMID><DateCompleted><Year>2012</Year><Month>10</Month><Day>02</Day></DateCompleted><DateRevised><Year>2010</Year><Month>12</Month><Day>14</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0027-5514</ISSN><JournalIssue CitedMedium="Print"><Volume>96</Volume><Issue>6</Issue><PubDate><MedlineDate>2004 Nov-Dec</MedlineDate></PubDate></JournalIssue><Title>Mycologia</Title><ISOAbbreviation>Mycologia</ISOAbbreviation></Journal><ArticleTitle>Molecular and morphological characterization of the willow rust fungus, Melampsora epitea, from arctic and temperate hosts in North America.</ArticleTitle><Pagination><MedlinePgn>1330-8</MedlinePgn></Pagination><Abstract><AbstractText>Current taxonomy places all rust fungi that occur on willow (Salix spp.) in North America in one species complex, Melampsora epitea Thüm. Characteristics of M. epitea isolates from the Canadian arctic were compared to M. epitea isolates from temperate regions of North America. Sequences from internal transcribed spacer (ITS) regions of rDNA were obtained from urediniospores from rust-infected Salix leaves collected in the Canadian arctic and in Minnesota and compared. Phylogenetic analysis of nuclear ribosomal ITS regions indicated that arctic M. epitea samples were divergent from temperate M. epitea isolates, perhaps in part because all rusts examined diverged according to host species. Four urediniospore characteristics were examined: area, circularity (shape factor), major axis length and spine density. Statistically significant (P < 0.05) differences were observed for spine density among all host species except S. nigra and S. bebbiana. However major axis length differed between these species. 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Blanchette</name><name sortKey="Newcombe, George" sort="Newcombe, George" uniqKey="Newcombe G" first="George" last="Newcombe">George Newcombe</name></noCountry><country name="États-Unis"><region name="Minnesota"><name sortKey="Smith, Jason A" sort="Smith, Jason A" uniqKey="Smith J" first="Jason A" last="Smith">Jason A. Smith</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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