A unique species in Phytophthora clade 10, Phytophthora intercalaris sp nov., recovered from stream and irrigation water in the eastern USA

作者：Yang X^*; Balci Y; Brazee N J; Loyd A L; Hong C X

来源：International Journal of Systematic and Evolutionary Microbiology, 2016, 66(2): 845-855.

DOI：10.1099/ijsem.0.000800

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 A(1) mating type. It produced rare ornamented oogonia and amphigynous antheridia when paired with A(2) 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 beta-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.

• 出版日期2016-2
• 单位美国弗吉尼亚理工大学(Virginia Tech)