2026-10-14T15:53:44Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34050382 2026-10-01T20:00:05Z category_24 category_272 category_39 category_734 category_133 portal_87 item_type_3 month_year_10_2026

New <i>Phytopythium</i> species associated with water and soil in Vietnam and USA Alina Puig (11720816) Catalina Salgado-Salazar (474203) Emily Pfeufer (25158601) Glen Groben (16813623) Chuanxue Hong (605813) Evolutionary Biology Environmental Sciences not elsewhere classified Ecology Biological Sciences not elsewhere classified Plant Biology Citrus forest irrigation pond oomycete plant biosecurity river tropical 2 new taxa <p><i>Phytopythium</i> is a recently established genus with sporangial morphology similar to <i>Phytophthora</i> and zoospore discharge similar to <i>Pythium</i>. It contains 27 officially recognized species including plant pathogens as well as aquatic saprophytes. Among the most widely distributed are <i>P. helicoides</i> and <i>P. vexans</i>, followed by <i>P. oedochilum</i> and <i>P. litorale</i>, each having been reported on six continents. This study uses morphological and molecular analyses to describe two novel <i>Phytopythium</i> species: <i>P. phamii</i> from river water in Vietnam and <i>P. virginianum</i> from an irrigation pond in the USA and citrus orchard soil in Vietnam. Based on the maximum likelihood and Bayesian phylogenies, <i>P. virginianum</i> and <i>P. phamii</i> generally grouped with members of the <i>Phytopythium</i> clade 2, near <i>P. chamaehyphon</i> and <i>P. helicoides</i>. Isolates of both species grew at temperatures between 7 and 35 C, with an optimum temperature of 30 C for <i>P. phamii</i> and 35 C for <i>P. virginianum</i>. Although abundant oospore production was observed in cultures of <i>P. phamii</i>, none was observed in cultures of <i>P. virginianum</i> on any of the media used. The formal description of these new species helps scientists and regulators understand the geographic distributions of organisms and identify potential emerging pathogens that can become a threat to agricultural crops.</p> 2026-10-01T20:00:05Z Dataset Dataset 10.6084/m9.figshare.34050382.v1 https://figshare.com/articles/dataset/New_i_Phytopythium_i_species_associated_with_water_and_soil_in_Vietnam_and_USA/34050382 CC BY 4.0