Phylogenetic relationships in the harmful dinoflagellate Cochlodinium polykrikoides (Gymnodiniales, Dinophyceae) inferred from LSU rDNA sequences

Mitsunori, Iwataki and Hisae, Kawami and Koichiro, Mizushima and Mikulski, Christina M. and Doucette, Gregory J. and Relox, Juan R. and Ann Anton, Datin and Yasuwo, Fukuyo and Kazumi, Matsuoka (2008) Phylogenetic relationships in the harmful dinoflagellate Cochlodinium polykrikoides (Gymnodiniales, Dinophyceae) inferred from LSU rDNA sequences. Harmful Algae, 7 (3). pp. 271-277. ISSN 1568-9883


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Phylogenetic relationships among chain-forming Cochlodinium species, including the harmful red tide forming dinoflagellate Cochlodinium polykrikoides, were investigated using specimens collected from coastal waters of Canada, Hong Kong, Japan, Korea, Malaysia, México, Philippines, Puerto Rico, and USA. The phylogenetic tree inferred from partial (D1-D6 regions) large subunit ribosomal RNA gene (LSU rDNA) sequences clearly differentiated between C. polykrikoides and a recently described species, Cochlodinium fulvescens. Two samples collected from the Pacific coasts of North America (British Columbia, Canada and California, USA) having typical morphological characters of C. fulvescens such as the sulcus located in the intermediate region of the cingulum, were closely related to C. fulvescens from western Japan in the phylogenetic tree. Cochlodinium polykrikoides formed a monophyletic group positioned as a sister group of the C. fulvescens clade with three well-supported sub-clades. These three clades were composed of (1) East Asian, including specimens collected from Hong Kong, western Japan, and southern Korea, (2) Philippines, from Manila Bay, Philippines and Omura Bay, Japan, and (3) American/Malaysian, from the Atlantic coasts of USA, the Pacific coast of México, Puerto Rico, and Borneo Island, Malaysia. Each of these clades is considered to be a so-called "ribotype" representing the population inhabiting each region, which is distinguished based on ribosomal RNA gene sequences in the species despite similarities in their morphological characters. © 2007 Elsevier B.V. All rights reserved.

Item Type: Article
Keyword: Cochlodinium fulvescens, Cochlodinium polykrikoides, Distribution, HAB, LSU rDNA, Phylogeny
Subjects: Q Science > QR Microbiology
Department: INSTITUTE > Biotechnology Research Institute (BRI)
Depositing User: ADMIN ADMIN
Date Deposited: 06 Apr 2011 15:26
Last Modified: 13 Oct 2017 11:48

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