Two new species of nematode-trapping fungi: relationships inferred from morphology,rDNA and protein gene sequence analyses |
| |
| Institution: | 1. Laboratory for Conservation and Utilization of Bio-resources, Yunnan University, Kunming 650091, Yunnan Province, PR China;2. Centre for Research in Fungal Diversity, Department of Ecology & Biodiversity, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China;1. Department of Microbiology, Faculty of Biological Sciences, University of Nigeria, Nsukka, PMB, 420001, Enugu State, Nigeria;2. Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, University of Nigeria, Nsukka, PMB, 420001, Enugu State, Nigeria;3. Department of Forest Sciences, University of Helsinki, P.O. Box 27, FIN-00014 Helsinki, Finland;4. Structure and Molecular Biology Program, Department of Cell and Molecular Biology, Uppsala University, Box 596, Biomedical Center, SE-751 24, Uppsala, Sweden;5. Department of Microbiology, Immunology and Biochemistry, University of Tennessee, Memphis, TN 38163, USA;6. Environmental Genetics and Molecular Toxicology Division, Department of Environmental Health, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0056, USA;1. Department of Agricultural Microbiology, College of Agriculture, Kerala Agricultural University, Vellayani P. O., Thiruvananthapuram, 695522, Kerala, India;2. Department of Nematology, College of Agriculture, Kerala Agricultural University, Vellayani P. O., Thiruvananthapuram, Kerala, India;1. Departamento de Veterinária, Universidade Federal de Viçosa, Viçosa, Minas Gerais CEP 36570-900, Brazil;2. Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios Fundação Oswaldo Cruz, Rio de Janeiro CEP 21040-360, Brazil;3. Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Viçosa, Viçosa, Minas Gerais CEP 36570-000, Brazil;1. Department of Biochemistry and Molecular Biology, Federal University of Viçosa, Viçosa, MG, Brazil;2. Department of Microbiology, Institute of Biotechnology Applied to Agriculture (BIOAGRO), Federal University of Viçosa, Viçosa, MG, Brazil;4. Department of Phytopatology, Federal University of Viçosa, Viçosa, MG, Brazil |
| |
| Abstract: | Two new nematode-trapping fungi, Dactylellina sichuanensis and D. varietas from China, which capture nematodes by both adhesive knobs and non-constricting rings, are described and illustrated. D. sichuanensis is characterized by both adhesive knobs and non-constricting rings, solitary conidiophores and 3-(4)-6 septate conidia, as compared with species such as D. appendiculata, D. candida, D. leptospora and D. lysipaga. Although D. sichuanensis shares similar types of trapping devices, the presence of simple conidiophores and spindle-shaped conidia with these species, it can be distinguished by its larger conidia and presence of more than four septa. In D. sichuanensis, a single conidium is born at the tip of conidiophore, while in D. candida, 3–10 conidia are born near the apex of conidiophore in a capitate arrangement. It produces spindle-shaped conidia with 3–6 septa, whereas D. leptospora produces cylindrical-shaped conidia with 5–15 septa. D. appendiculata captures nematodes by adhesive knobs whereas D. sichuanensis captures nematodes by both adhesive knobs and non-constricting rings. They also differ in conidial size (35–82.5 μm in D. sichuanensis as compared with 57–108 μm in D. appendiculata). D. varietas is characterized by conidiophores that are branched at right-angles, and elongate to fusoid conidia, with 7–8 septa (more than 25% of which are curved). D. varietas resembles D. asthenopaga, Dactylella oxyspora and Monacrosporium multiseptatum, but has elongate-fusoid conidia, whereas D. asthenopaga possesses obconical or clavate conidia. D. varietas forms both adhesive knobs and non-constricting rings whereas Dactylella oxyspora does not produce any trapping device. M. multiseptatum differs from D. varietas in having larger conidia with an inflated middle cell. Phylogenetic analyses based on nuclear and protein coding DNA sequences (18 S, and a combined 28 S + 5.8 S + β-tubulin dataset) indicate that these two taxa should be assigned to the family Orbiliaceae. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
