Phytophthora quercetorum sp. nov., a novel species isolated from eastern and north-central USA oak forest soils |
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| Authors: | Yilmaz Balci Selin Balci Jaime E. Blair Sook-Young Park Seogchan Kang William L. Macdonald |
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| Affiliation: | aWest Virginia University, Division of Plant and Soil Sciences, 1090 South Agricultural Sciences Building, Morgantown, WV, USA;bAmherst College, Department of Biology, Amherst, MA 01002, USA;cThe Pennsylvania State University, Department of Plant Pathology, University Park, PA 16802, USA |
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| Abstract: | Isolates belonging to an undescribed Phytophthora species were frequently recovered during an oak forest soil survey of Phytophthora species in eastern and north-central USA in 2004. The species was isolated using an oak leaf baiting method from rhizosphere soil samples collected from Quercus rubra, Q. macrocarpa, and Q. phellos. This species is formally described as P. quercetorum. It is homothallic and has aplerotic oogonia and paragynous antheridia. It produces papillate sporangia (occasionally bipapillate) of ovoid-elongated shapes. Its temperature optimum for growth is ca 22.5 °C with the upper limit of ca 32.5 °C. P. quercetorum differs from the morphologically related P. quercina in producing distinct submerged colony-patterns, different growth-temperature requirements, and oogonial shapes and sizes. Phylogenetic analyses using seven nuclear loci supported P. quercetorum as a novel species within clade 4, closely related to P. arecae, P. palmivora, P. megakarya, and P. quercina. |
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| Keywords: | Forest pathology Oak decline Oomycetes Oomycota Quercus |
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