<Emphasis Type="Italic">Pythium apinafurcum</Emphasis>: its morphology,molecular phylogeny,and infectivity for plants |
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Authors: | Shihomi Uzuhashi Motoaki Tojo Sakura Kobayashi Makoto Kakishima |
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Institution: | (1) Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan;(2) Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka, Japan |
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Abstract: | During a survey of Pythium species in soils of Japan, Pythium isolates growing at high temperatures were obtained from an uncultivated field soil in Wakayama Prefecture. All six isolates
showed similar morphology to each other and had complexly branched secondary hyphae, globose nonproliferating sporangia, and
smooth-surfaced oogonia that have one or two oospores per oogonium. The combination of these characteristics differentiated
these isolates from other Pythium species reported. Phylogenetic analyses based on sequences of the ribosomal DNA ITS and D1/D2 region of the large subunit
showed that all Pythium isolates were clustered in a single clade that was distantly related to other known clades of the genus. We described these
isolates as a new Pythium species, Pythium apinafurcum, based on morphology and molecular phylogeny. The P. apinafurcum isolates nonsymptomatically infected the roots of seedlings of bermudagrass, cabbage, and cucumber in a pot inoculation test. |
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Keywords: | D1/D2 Intraspecific New species rDNA Taxonomy |
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