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Five Non-motile Dinotom Dinoflagellates of the Genus . | LitMetric

Five Non-motile Dinotom Dinoflagellates of the Genus .

Front Plant Sci

Department of Biological Sciences, Faculty of Science, Hokkaido University, Sapporo, Japan.

Published: November 2020

and are benthic dinoflagellates possessing diatom-derived tertiary plastids, so-called dinotoms. Due to the lack of available genetic information, their phylogenetic relationship remains unknown. In this study, sequencing of 18S ribosomal DNA (rDNA) and the L gene from temporary cultures isolated from natural samples revealed that they are close relatives of another dinotom, . The morphologies of these three dinotoms differ significantly from each other; however, they share a distinctive life cycle, in which the non-motile cells without flagella are their dominant phase. Cell division occurs in this non-motile phase, while swimming cells only appear for several hours after being released from each daughter cell. Furthermore, we succeeded in isolating and establishing two novel dinotom strains, HG180 and HG204, which show a similar life cycle and are phylogenetically closely related to the aforementioned three species. The non-motile cells of strain HG180 are characterized by the possession of a hemispheroidal cell covered with numerous nodes, while those of the strain HG204 form aggregations consisting of spherical smooth-surface cells. Based on the similarity in life cycles and phylogenetic closeness, we conclude that all five species should belong to a single genus, , the oldest genus within this clade. We transferred and to , and described strains HG180 and HG204 as sp. nov. and sp. nov.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7710806PMC
http://dx.doi.org/10.3389/fpls.2020.591050DOI Listing

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