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Erysiphe abbreviata on cherry bark oak—morphology, phylogeny and taxonomy

     Institute of Biology, Geobotany and Botanical Garden, Herbarium, Martin Luther University, Neuwerk 21, D-06099 Halle, Germany

Ainong Shi ¹
Margaret Mmbaga

     Otis L. Floyd Nursery Research Center, Institute of Agriculture and Environmental Research, Tennessee State University, 472 Cadillac Lane, McMinnville, Tennessee 37110

Susumu Takamatsu

     Laboratory of Plant Infection, Faculty of Bioresources, Mie University, 1515 Kamihama, Tsu 514-8507, Japan

Rangsi Divarangkoon

     Department of Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiangmai 50200, Thailand

Pengyin Chen

     Department of Crop, Soil, and Environmental Sciences, University of Arkansas, AR 72701, USA

Powdery mildew on cherry bark oak (Quercus falcate var. pagodifolia) collected in Tennessee, USA, was determined to be Erysiphe abbreviata, a species confined to North America. The diagnostically important anamorph of this species is described for the first time. Sequence analyses of the rDNA ITS region and D1/D2 domains of the 28S rDNA were used to obtain phylogenetic data for and taxonomic conclusions about this species. The structure of the anamorph (Oidium subgen. Pseudoidium) and the molecular data support the placement of this species in Erysiphe emend. (including Microsphaera) as a species separate from the Eurasian Erysiphe alphitoides.

Key words: anamorph, cherry bark oak, Erysiphe abbreviata, Erysiphe sect. Microsphaera, internal transcribed spacer (ITS), powdery mildew, Quercus falcata var. pagodifolia, 28S rDNA