Abstract
An attempt was made to infer the phylogeny of Pseudo-nitzschia species by using the mitochondrial-encoded gene, cytochrome c oxidase subunit I (cox1), and comparing it with the nuclear-encoded large subunit ribosomal DNA (LSU rDNA). A pair of primers targeting Pseudo-nitzschia cox1 was designed in silico and used to infer the molecular phylogeny of Pseudo-nitzschia. The primer pair was tested using genomic DNAs isolated from six species of Pseudo-nitzschia from Malaysia. The phylogenetic inference of cox1 was then compared to the LSU rDNA phylogeny. Phylogenetic reconstructions of both data sets revealed monophyly of Pseudo-nitzschia species complexes. The range of genetic divergences among Pseudo-nitzschia species were higher in the cox1 data set (3.5–20.4 %) compared to the LSU rDNA data set (0.1–8.8 %). The present study suggests that high genetic divergence in cox1 of Pseudo-nitzschia species could be a useful genetic marker for DNA bar coding.
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This work was supported by the Malaysian Government through the Ministry of Education under KPM-JSPS COMSEA Matching Fund (GA002-2014), the Higher Institution Centre of Excellence Research Grant (IOES-2014C); and the University of Malaya Research Program (RU006A/B-2014). This work formed part of the MSc project of SN Tan.
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Tan, S.N., Lim, H.C., Teng, S.T. et al. Pseudo-nitzschia species (Bacillariophyceae) identification and delineation using mitochondrial cox1 gene sequences as compared to LSU rDNA. Fish Sci 81, 831–838 (2015). https://doi.org/10.1007/s12562-015-0902-7
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DOI: https://doi.org/10.1007/s12562-015-0902-7