Balci Yilmaz, Balci Selin, Blair Jaime E, Park Sook-Young, Kang Seogchan, Macdonald William L
West Virginia University, Division of Plant and Soil Sciences, 1090 South Agricultural Sciences Building, Morgantown, WV, USA.
Mycol Res. 2008 Aug;112(Pt 8):906-16. doi: 10.1016/j.mycres.2008.02.008. Epub 2008 Mar 25.
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 degrees C with the upper limit of ca 32.5 degrees 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.
2004年在美国东部和中北部进行的栎树林土壤疫霉属物种调查中，经常分离出属于一种未描述过的疫霉属物种的菌株。该物种是通过栎叶诱饵法从红栎、大果栎和黄樟的根际土壤样本中分离出来的。该物种被正式描述为栎疫霉。它是同宗配合的，具有无孔卵孢子囊和侧生雄器。它产生乳头状孢子囊（偶尔双乳头状），呈卵形至细长形。其生长的最适温度约为22.5℃，上限约为32.5℃。栎疫霉与形态相关的栎生疫霉的不同之处在于，它产生明显的淹没菌落模式、不同的生长温度要求以及卵孢子囊的形状和大小。使用七个核基因座进行的系统发育分析支持栎疫霉是进化枝4中的一个新物种，与槟榔疫霉、棕榈疫霉、巨果疫霉和栎生疫霉密切相关。
