Journal
MYCOLOGICAL PROGRESS
Volume 20, Issue 4, Pages 431-451Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11557-021-01681-0
Keywords
Hyphomycetous fungi; Phylogenetic informativeness; Phytopathogens; Saprobes
Categories
Funding
- University of Sri Jayewardenepura [ASP/01/RE/SCI/2018/036]
- Mycological Society of America
- USDA-ARS National Program 303 [804222000-298-00D]
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This study identified three new species of Curvularia through multi-locus phylogenetic analyses based on specimens collected from cereal and weedy grass hosts in Sri Lanka. Morphological descriptions and illustrations were provided for the newly described taxa. The research highlights the importance of extensive collections and molecular identifications of tropical hyphomycetous fungi associated with cereals, fibre crops and weeds for effective disease management and surveillance measures.
The genus Curvularia comprises phytopathogenic, saprobic, epiphytic and endophytic fungal species associated with cereal crops and their wild relatives. Recently, multi-locus phylogenetic studies have been widely implemented for accurate identification of Curvularia, at the species level. Although the genus is taxonomically diverse, the species associated with cereal crops and weeds are poorly known in Sri Lanka. In this study, symptomatic specimens of cereals and associated weedy grass hosts were collected from selected locations in Sri Lanka. The isolates obtained were initially identified based on microscopic characters. The nuclear ribosomal internal transcribed spacers 1 and 2 with 5.8S region (ITS), glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and translation elongation factor 1-alpha (TEF1) loci were sequenced and used in multi-locus phylogenetic analyses. Three novel evolutionary lineages were identified, distinct from all the currently accepted species of Curvularia. To accommodate the novel phylogenetic lineages, three novel species of Curvularia are described, namely Curvularia eleusinicola, C. panici-maximi and C. simmonsii. Morphological descriptions and illustrations are provided for the newly described taxa. In addition, host records are updated for recently introduced C. plantarum and C. pseudointermedia. This study highlights the need for extensive collections and molecular identifications of tropical species of hyphomycetous fungi associated with cereals, fibre crops and weeds in order to support effective disease management and surveillance measures.
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