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Sequence Analysis of 5.8S rDNA and the Internal Transcribed Spacer Region in Dinoflagellate Heterocapsa Species (Dinophyceae) and Development of Selective PCR Primers for the Bivalve Killer Heterocapsa circularisquama


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Title: Sequence Analysis of 5.8S rDNA and the Internal Transcribed Spacer Region in Dinoflagellate Heterocapsa Species (Dinophyceae) and Development of Selective PCR Primers for the Bivalve Killer Heterocapsa circularisquama
Authors: Yoshida, Takashi / Nakai, Ryuichi / Seto, Hisatake / Wang, Ming-Kui / Iwataki, Mitsunori / Hiroishi, Shingo
Issue Date: Dec-2003
Publisher: 日本微生物生態学会
Citation: Microbes and environments. 2003, 18(4), p.216-222
Abstract: Algal exposure assays revealed that all tested strains of H. circularisquama and H. illdefina were markedly toxic to juvenile pearl oysters. H. triquetra, and Heterocapsa sp. 3 and sp. 5 caused low levels of mortality in juveniles (1.7-7.5%), whereas H. lanceolata, H. horiguchii and Heterocapsa sp. 4 caused no mortality. Three strains of H, circularisquama alone exhibited strong toxicity against bivalves among Heterocapsa species isolated in Japan. The sequencing of internal transcribed spacer (ITS) regions including 5.8S rDNA and phylogenetic analysis were performed for isolates of Heterocapsa species. Alignment of the sequences demonstrated that ITS regions were highly conserved among H. circularisquama strains, while the distance between H. circularisquama and other species ranged from 0.165 to 0.254. Except for H. horiguchii and Heterocapsa sp. 4, the phylogenetic tree obtained was congruent with morphological identification. Heterocapsa species were subjected to PCR amplification with a primer set designed based on a specific signature sequence for H. circularisquama in the ITS 2 region. A specific band was detected for all strains of H. circularisquama but not other Heterocapsa species, indicating that the ITS region is suitable as a species-specific marker for H. circularisquama.
Keywords: dinoflagellate / Heterocapsa circularisquama / internal transcribed spacer / ITS / red tide
URI: http://hdl.handle.net/10069/18722
ISSN: 13426311
Relational Links: http://ci.nii.ac.jp/naid/110001269350/
Rights: 日本微生物生態学会 / 本文データは学協会の許諾に基づきCiNiiから複製したものである
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/18722

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