Studies in Mycology (2014) 79, 1-47

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J.H.C. Woudenberg, M. Truter, J.Z. Groenewald and P.W. Crous (2014)
Large-spored Alternaria pathogens in section Porri disentangled
Studies in Mycology 79 (1), 1-47
Abstract: The omnipresent fungal genus Alternaria was recently divided into 24 sections based on molecular and morphological data. Alternaria sect. Porri is the largest section, containing almost all Alternaria species with medium to large conidia and long beaks, some of which are important plant pathogens (e.g. Alternaria porri, A. solani and A. tomatophila). We constructed a multi-gene phylogeny on parts of the ITS, GAPDH, RPB2, TEF1 and Alt a 1 gene regions, which, supplemented with morphological and cultural studies, forms the basis for species recognition in sect. Porri. Our data reveal 63 species, of which 10 are newly described in sect. Porri, and 27 species names are synonymised. The three known Alternaria pathogens causing early blight on tomato all cluster in one clade, and are synonymised under the older name, A. linariae. Alternaria protenta, a species formerly only known as pathogen on Helianthus annuus, is also reported to cause early blight of potato, together with A. solani and A. grandis. Two clades with isolates causing purple blotch of onion are confirmed as A. allii and A. porri, but the two species cannot adequately be distinguished based on the number of beaks and branches as suggested previously. This is also found among the pathogens of Passifloraceae, which are reduced from four to three species. In addition to the known pathogen of sweet potato, A. bataticola, three more species are delineated of which two are newly described. A new Alternaria section is also described, comprising two large-spored Alternaria species with concatenate conidia.
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Database assignments for author(s): J.H.C. Woudenberg, Pedro W. Crous, Johannes Z. Groenewald

Research topic(s) for pests/diseases/weeds:
identification/taxonomy


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Alternaria dauci Carrot (Daucus carota) Italy
Alternaria dauci Carrot (Daucus carota) U.S.A. (SW)
Alternaria dauci Carrot (Daucus carota) New Zealand
Alternaria dauci Chicory/endive (Cichorium) Netherlands
Alternaria dauci Coriander (Coriandrum sativum) Puerto Rico
Alternaria crassa Cyprus
Alternaria crassa New Zealand
Alternaria solani Italy
Alternaria solani Potato (Solanum tuberosum) U.S.A. (NW)
Alternaria solani Broad/faba bean (Vicia faba) New Zealand
Alternaria cucumerina Melon (Cucumis melo) Australia (NT+QLD)
Alternaria cucumerina Luffa (genus) U.S.A. (Hawaii)
Alternaria porri Onion/garlic/leek (Allium) U.S.A. (mid N)
Alternaria carthami Italy
Alternaria carthami U.S.A. (NW)
Alternaria carthami Sunflower (Helianthus annuus) Canada (west)
Alternaria zinniae Hungary
Alternaria zinniae Zinnia (crop) Italy
Alternaria zinniae Zinnia (crop) Netherlands
Alternaria zinniae Zinnia (crop) United Kingdom
Alternaria zinniae Zinnia (crop) New Zealand
Alternaria macrospora Cotton (Gossypium) U.S.A. (SW)
Alternaria macrospora Cotton (Gossypium) Nigeria
Alternaria sesami Sesame (Sesamum orientale) India
Alternaria sesami Sesame (Sesamum orientale) Egypt
Alternaria tagetica Tagetes (crop) United Kingdom
Alternaria tagetica Tagetes (crop) U.S.A. (NE)
Alternaria bataticola Sweet potato (Ipomoea batatas) Japan
Alternaria bataticola Sweet potato (Ipomoea batatas) South Africa
Alternaria bataticola Sweet potato (Ipomoea batatas) Australia (NT+QLD)
Alternaria blumeae Thailand
Alternaria blumeae Beans (Phaseolus) Brazil (south)
Alternaria cassiae Malaysia
Alternaria cassiae Senna (crop) Brazil (south)
Alternaria cassiae Senna (crop) U.S.A. (mid S)
Alternaria cassiae Hibiscus (crop) Fiji Islands
Alternaria protenta Potato (Solanum tuberosum) U.S.A. (SW)
Alternaria protenta Potato (Solanum tuberosum) New Zealand
Alternaria protenta Sunflower (Helianthus annuus) Israel
Alternaria protenta Euphorbia (crop) Australia (NT+QLD)
Alternaria grandis Potato (Solanum tuberosum) U.S.A. (NE)
Alternaria dichondrae Dichondra (crop) Italy
Alternaria dichondrae Dichondra (crop) New Zealand
Alternaria cichorii Chicory/endive (Cichorium) Cyprus
Alternaria cichorii Chicory/endive (Cichorium) Greece
Alternaria ricini Castor-bean (Ricinus communis) Italy
Alternaria ricini Castor-bean (Ricinus communis) Japan
Alternaria ricini Castor-bean (Ricinus communis) U.S.A. (NE)