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KMID : 0364820200560010036
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Korean Journal of Microbiology
2020 Volume.56 No. 1 p.36 ~ p.43
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A study of newly recorded species for freshwater cyanobacteria Microcystis protocystis (Chroococcales, Cyanobacteria) in Korea
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Lee Nam-Ju
Seo Yo-Seph
Ki Jang-Seu
Lee Ok-Min
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Abstract
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Microcystis protocystis was sampled from the Nakdong River, Geum River, and freshwaters of Yongin and Incheon. Within 3 days after sampling, morphologies of colonies and mucilage were observed using India ink. The colony of M. protocystis has irregular outlines and lacks distinct lobes and holes. Cells are distributed sparsely and irregularly within indistinct and homogeneous slime, which is diffuse at the margin. Three unispecific cultured strains from the So-ok stream were classified as Microcystis by phylogenetic analysis using 16S rRNA sequences. Three Korean isolates of M. protocystis showed 16S rRNA sequences completely identical to each other. The phylogenetic tree of the 16S rRNA sequences showed that Korean M. protocystis formed narrow clusters with other Microcystis members and M. protocystis with 99% or greater similarities. Additional trees of RNA polymerase beta-subunit gene (rpoB) sequences separated the Korean M.
protocystis from other Microcystis. Through these results, M.
protocystis was reported as a new species in Korea.
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KEYWORD
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Microcystis protocystis, cyanobacteria, freshwater algae, newly recorded species
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