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- Volume 66 Number 2
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f A unique species in Phytophthora clade 10, Phytophthora intercalaris sp. nov., recovered from stream and irrigation water in the eastern USA
- Authors: X. Yang1 , Y. Balci2 , N. J. Brazee3 , A. L. Loyd4,† , C. X. Hong1
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- VIEW AFFILIATIONS
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1 1Hampton Roads Agricultural Research and Extension Center, Virginia Tech, Virginia Beach, VA, USA 2 2Department of Plant Sciences and Landscape Architecture, University of Maryland, College Park, MD, USA 3 3UMass Extension, Center for Food, Agriculture and the Environment, University of Massachusetts, Amherst, MA, USA 4 4Department of Plant Pathology, North Carolina State University, Raleigh, NC, USA
- Correspondence X. Yang [email protected]
- First Published Online: 01 February 2016, International Journal of Systematic and Evolutionary Microbiology 66: 845-855, doi: 10.1099/ijsem.0.000800
- Subject: NEW TAXA - Eukaryotic micro-organisms
- Cover date:




A unique species in Phytophthora clade 10, Phytophthora intercalaris sp. nov., recovered from stream and irrigation water in the eastern USA, Page 1 of 1
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A novel species of the genus Phytophthora was recovered during surveys of stream and nursery irrigation water in Maryland, Massachusetts, North Carolina, Virginia and West Virginia in the USA. The novel species is heterothallic, and all examined isolates were A1 mating type. It produced rare ornamented oogonia and amphigynous antheridia when paired with A2 mating type testers of Phytophthora cinnamomi and Phytophthora cryptogea. Sporangia of this novel species were non-papillate and non-caducous. Thin-walled intercalary chlamydospores were abundant in hemp seed agar and carrot agar, while they were produced only rarely in aged cultures grown in clarified V8 juice agar. Phylogenetic analyses based on sequences of the internal transcribed spacer region and the β-tubulin and mitochondrial cytochrome-c oxidase 1 (cox1) genes indicated that the novel species is phylogenetically close to Phytophthora gallica in Phytophthora clade 10. The novel species has morphological and molecular features that are distinct from those of other species in Phytophthora clade 10. It is formally described here as Phytophthora intercalaris sp. nov. Description of this unique clade-10 species is important for understanding the phylogeny and evolution of Phytophthora clade 10.
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†
Present address: Bartlett Tree Research Laboratories, Charlotte, NC, USA.
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The GenBank/EMBL/DDBJ accession numbers for the ITS and cox1 and β-tubulin gene sequences of isolate 45B7T are KT163268 KT163315 and KT163336, respectively.
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A supplementary table and two supplementary figures are available with the online Supplementary Material.
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Abbreviations: ITS internal transcribed spacer ML maximum-likelihood SOD sudden oak death.
© 2015 IUMS | Published by the Microbiology Society
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