Gymnodinium smaydae n. sp., a New Planktonic Phototrophic Dinoflagellate from the Coastal Waters of Western Korea: Morphology and Molecular Characterization SCIE SCOPUS

Cited 14 time in WEB OF SCIENCE Cited 14 time in Scopus
Title
Gymnodinium smaydae n. sp., a New Planktonic Phototrophic Dinoflagellate from the Coastal Waters of Western Korea: Morphology and Molecular Characterization
Author(s)
Kang, Nam Seon; Jeong, Hae Jin; Moestrup, Ojvind; Lee, Sung Yeon; Lim, An Suk; Jang, Tae Young; Lee, Kyung Ha; Lee, Moo Joon; Jang, Se Hyeon; Potvin, Eric; Lee, Sook Kyung; Noh, Jae Hoon
KIOST Author(s)
Noh, Jae Hoon(노재훈)
Publication Year
2014-03
Abstract
The marine phototrophic dinoflagellate Gymnodinium smaydae n. sp. is described from cells prepared for light, scanning, and transmission electron microscopy. Also, sequences of the small (SSU) and large subunits (LSU) and the internal transcribed spacer region (ITS1-5.8S-ITS2) of ribosomal DNA were analyzed. This newly isolated dinoflagellate possessed nuclear chambers, nuclear fibrous connective, an apical groove running in a counterclockwise direction around the apex, and a major accessory pigment peridinin, which are four key features for the genus Gymnodinium. The epicone was conical with a round apex, while the hypocone was ellipsoid. Cells growing photosynthetically were 6.3-10.9m long and 5.1-10.0m wide, and therefore smaller than any other Gymnodinium species so far reported except Gymnodinium nanum. Cells were covered with polygonal amphiesmal vesicles arranged in 11 horizontal rows, and the vesicles were smaller than those of the other Gymnodinium species. This dinoflagellate had a sharp and elongated ventral ridge reaching half way down the hypocone, unlike other Gymnodinium species. Moreover, displacement of the cingulum was 0.4-0.6xcell length while in other known Gymnodinium species it is less than 0.3xcell length. In addition, the new species possessed a peduncle, permanent chloroplasts, pyrenoids, trichocysts, pusule systems, and small knobs along the apical furrow, but it lacked an eyespot, nematocysts, and body scales. The sequence of the SSU, ITS1-5.8S-ITS2, and LSU rDNA region differed by 1.5-3.8%, 6.0-17.4%, and 9.1-17.5%, respectively, from those of the most closely related species. The phylogenetic trees demonstrated that the new species belonged to the Gymnodinium clade at the base of a clade consisting of Gymnodinium acidotum, Gymnodinium dorsalisulcum, Gymnodinium eucyaneum, etc. Based on morphological and molecular data, we suggest that the taxon represents a new species, Gymnodinium smaydae n. sp.
ISSN
1066-5234
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/40418
DOI
10.1111/jeu.12098
Bibliographic Citation
JOURNAL OF EUKARYOTIC MICROBIOLOGY, v.61, no.2, pp.182 - 203, 2014
Publisher
WILEY
Subject
SP-NOV DINOPHYCEAE; ELECTRON-MICROSCOPIC OBSERVATIONS; RED-TIDE; COMB. NOV; HETEROTROPHIC DINOFLAGELLATE; FLAGELLAR APPARATUS; FORMING DINOFLAGELLATE; GREEN DINOFLAGELLATE; WOLOSZYNSKIA-CINCTA; AUSTRALIAN WATERS
Keywords
ITS; large subunit; mixotrophy; peduncle; protist; small subunit; taxonomy
Type
Article
Language
English
Document Type
Article
Publisher
WILEY
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