A new potentially toxic dinoflagellate Fukuyoa koreansis sp. nov. (Gonyaulacales, Dinophyceae) from Korean coastal waters: Morphology, phylogeny, and effects of temperature and salinity on growth SCIE SCOPUS

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Title
A new potentially toxic dinoflagellate Fukuyoa koreansis sp. nov. (Gonyaulacales, Dinophyceae) from Korean coastal waters: Morphology, phylogeny, and effects of temperature and salinity on growth
Author(s)
Li, Zhun; Park, Joon Sang; Kang, Nam Seon; Chomérat, Nicolas; Mertens, Kenneth Neil; Gu, Haifeng; Lee, Kyun Woo; Kim, Ki Hyun; Baek, Seung Ho; Shin, Kyoung Soon; Han, Kyong Ha; Son, Moon Ho; Shin, Hyeon Ho
KIOST Author(s)
Park, Joon Sang(박준상)Lee, Kyun Woo(이균우)Baek, Seung Ho(백승호)Shin, Kyoung Soon(신경순)Han, Kyong Ha(한경하)Shin, Hyeon Ho(신현호)
Alternative Author(s)
박준상; 이균우; 백승호; 신경순; 한경하; 신현호
Publication Year
2021-11
Abstract
To clarify an unspecified toxic Gambierdiscus-like species isolated from seawaters off Jeju Island, Korea, its morphology and molecular phylogeny based on the small subunit (SSU) and partial large subunit (LSU) rRNA gene sequences were examined. Cells were narrow in ventral view and broad in lateral view with a smooth surface. The round thecal pores were evenly distributed, with an average diameter of 0.41 µm. Cell depth, width and height were 51.7 ± 4.5 μm, 43.0 ± 4.2 μm and 55.0 ± 4.7 μm, respectively, and depth-to-width (D/W) and height-to-width (H/W) ratios were 1.1 ± 0.2 μm and 1.3 ± 0.02 μm, respectively. The nucleus was located in the hypotheca. Scanning electron microscope observations revealed that the cells displayed a plate formula of Po, 4′, 6′′, 6c, 6s, 5′′′ and 2′′′, and transmission electron microscope observation demonstrated that the cells contained crystal-like particles. Morphological features indicated that the unspecified Korean isolate belonged to the genus Fukuyoa, and based on the H/W and D/W ratios, the apical pore H/W ratio and thecal pore size, it could be differentiated from other Fukuyoa species. The phylogenetic analyses based on the SSU and LSU rRNA sequences revealed that the Korean isolate was nested within the genus Fukuyoa with high support, and it grouped with F. cf. yasumotoi isolated from Japan. Based on the morpho-molecular data, a new species, Fukuyoa koreansis sp. nov. is proposed. The maximum growth rate (0.254 d−1) of F. koreansis was observed at 25°C and a salinity of 25. The required levels of temperature and salinity for growth distinguished Fukuyoa koreansis from Gambierdiscus species.
ISSN
1568-9883
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/41670
DOI
10.1016/j.hal.2021.102107
Bibliographic Citation
Harmful Algae, v.109, 2021
Publisher
Elsevier BV
Keywords
Gambierdiscus; Growth rate; rRNA; SEM; TEM; Toxic dinoflagellate
Type
Article
Language
English
Document Type
Article
Publisher
Elsevier BV
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