Abstract
Biodiversity surveys of natural as well as agricultural ecosystems commonly reveal novel isolates. Here we report a new species, Pythium yorkensis sp. nov., isolated from field soil during a survey of oomycete diversity in asymptomatic soybean across southeastern Pennsylvania. Molecular data from both mitochondrial and nuclear loci support a unique phylogenetic position for the isolates collected, and morphological features distinguish this new species from close relatives in Pythium Clade J. Pathogenicity assays suggest that this new species may be a potential agricultural pathogen as isolates were mildly aggressive on soybean. This study highlights the continued need for culture-based surveys in collaboration with high-throughput sequence-based approaches for environmental sampling. This article is protected by copyright. All rights reserved.
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