Morphological and molecular characterization of <Emphasis Type="Italic">Oidium</Emphasis> subgenus <Emphasis Type="Italic">Reticuloidium</Emphasis> (powdery mildew) newly occurred on cucumber in Japan |
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| Authors: | Keiko Uchida Susumu Takamatsu Sanae Matsuda Kazuhiro So Yukio Sato |
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| Institution: | (1) ZEN-NOH Agricultural R&D Center, 5-5-1 Higashi-Yahata, Hiratsuka 254-0016, Japan;(2) Graduate School of Bioresources, Mie University, 1577 Kurima-Machiya, Tsu 514-8507, Japan;(3) Department of Liberal Arts and Sciences, Faculty of Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu 939-0398, Japan |
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| Abstract: | In 2002, a powdery mildew with catenate conidia lacking fibrosin bodies was found on cucumber in a greenhouse in Kanagawa
Prefecture, Japan. Morphological observation revealed that the fungus belongs to Oidium subgenus Reticuloidium, anamorph of the genus Golovinomyces. Molecular phylogenetic analyses of the nucleotide sequences of the rDNA ITS regions and D1/D2 domains of the 28S rDNA indicated
that the fungus belongs to the clade of G. orontii with other Golovinomyces fungi from a wide range of host plants, suggesting that the fungus was newly transported from abroad. Because there has been
no prior report of cucumber powdery mildew caused by Reticuloidium, further research on the physiology, epidemiology, control and resistant cucumber varieties is required. |
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| Keywords: | Cucumis sativus Erysiphaceae Golovinomyces orontii Molecular phylogeny Morphological observation rDNA sequence |
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