01812nas a2200205 4500008004100000022001300041245011600054210006900170260001200239300001400251490000800265520114100273100001801414700001701432700002001449700002101469700001901490700002601509856007101535 2008 eng d a0953756200aPhytophthora quercetorum sp. nov., a novel species isolated from eastern and north-central USA oak forest soils0 aPhytophthora quercetorum sp nov a novel species isolated from ea c08/2008 a906 - 9160 v1123 a

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.

1 aBalci, Yilmaz1 aBalci, Selin1 aBlair, Jaime, E1 aPark, Sook-Young1 aKang, Seogchan1 aMacdonald, William, L uhttp://www.sciencedirect.com/science/article/pii/S0953756208000841