Coelastrella astaxanthina sp. nov. (Sphaeropleales, Chlorophyceae), a novel microalga isolated from an asphalt surface in midsummer in Japan

SUMMARY We taxonomically examined an algal strain (Ki‐4) isolated from a dry asphalt surface in mid‐summer of 2003. The vegetative cells were solitary, covered by a cell wall ornamented with meridional ribs, and contained hollow spherical chloroplasts and a pyrenoid. The cells exhibited a high toler...

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Bibliographic Details
Published in:Phycological research 2020-04, Vol.68 (2), p.107-114
Main Authors: Kawasaki, Shinji, Yoshida, Risako, Ohkoshi, Kiichi, Toyoshima, Hiroki
Format: Article
Language:English
Subjects:
Algae
Asphalt
Astaxanthin
Cell culture
Cell walls
Chloroplasts
Coloration
Colour
DNA
dry conditions
New species
Oxidative stress
photo‐oxidative stress
Phylogeny
Proteins
Ribs (structural)
Scenedesmaceae
terrestrial microalgae
Vegetative cells
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Summary:SUMMARY We taxonomically examined an algal strain (Ki‐4) isolated from a dry asphalt surface in mid‐summer of 2003. The vegetative cells were solitary, covered by a cell wall ornamented with meridional ribs, and contained hollow spherical chloroplasts and a pyrenoid. The cells exhibited a high tolerance to unfavorable photo‐oxidative stress conditions, and in culture developed a reddish coloration due to the accumulation of a water‐soluble astaxanthin‐binding protein, which was identified as a novel protein in organisms. 18S rDNA and ITS2 sequence analyses revealed that Ki‐4 belongs to Coelastrella sensu lato (Scenedesmaceae), but was taxonomically distinct from other members of the genus. On the basis of its phylogenetic position and morphological features, including the structures of cell wall ribs, we identify Ki‐4 as a new algal species in the genus Coelastrella, for which we propose the name Coelastrella astaxanthina sp. nov.
ISSN:1322-0829
1440-1835
DOI:10.1111/pre.12412