Phylogenetic analysis on a strain of Alexandrium tamarense collected from Antarctic Ocean

► A toxic A. tamarense strain was isolated from the Antarctic Ocean. ► 28S rDNA and ITS sequences of the strain were reported. ► The stain is growing fast (0.37day−1) with max cell density of 23,000cell/ml. ► Phylogenetic analysis shown that the strain was fell within in Group IV ribotypes. ► The st...

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Bibliographic Details
Published in:Harmful algae 2012-03, Vol.15, p.100-108
Main Authors: Ho, Kin-Chung, Lee, Thomas Chun-Hung, Kwok, Oi-Ting, Lee, Fred Wang-Fat
Format: Article
Language:English
Subjects:
28S rDNA
Algae
Animal and plant ecology
Animal, plant and microbial ecology
Antarctic Ocean
Autoecology
Biological and medical sciences
Dinoflagellate
Fundamental and applied biological sciences. Psychology
Harmful algal blooms
ITS
Plant cytology, morphology, systematics, chorology and evolution
Plants and fungi
Thallophyta
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Summary:► A toxic A. tamarense strain was isolated from the Antarctic Ocean. ► 28S rDNA and ITS sequences of the strain were reported. ► The stain is growing fast (0.37day−1) with max cell density of 23,000cell/ml. ► Phylogenetic analysis shown that the strain was fell within in Group IV ribotypes. ► The strain was most closely affiliated to Alexandrium isolates from the China Sea. A PST-toxin producing Alexandrium species was found and successfully isolated from the Antarctic Ocean (Southern Ocean) in 2001 (Ho et al., 2003). The species was identified as Alexandrium tamarense based on their morphological features and thecal plate analysis previously. Mono-culture of this Antarctic Alexandrium strain, designated as Kci, has been successfully kept in our laboratory. In order to gain more insight into the origin of this strain, phylogenetic relationship of this Alexandrium strain to other Alexandrium spp. within the A. tamarense complex was carried out using 28S and ITS rDNA sequences. These are the first such sequences reported for an Alexandrium spp. found in Antarctic Ocean. Based on the ribosomal DNA sequences and phylogenetic analysis, the Antarctic Alexandrium strain was fell within the ribotypes in Group IV of the group-numbering scheme as suggested by Lilly et al. (2007). Interestingly, the Antarctic Alexandrium strain Kci was closely affiliated to Alexandrium isolates from the China Sea.
ISSN:1568-9883
1878-1470
DOI:10.1016/j.hal.2011.12.004