Morphology, ultrastructure and phylogeny of Cyanothece sp. (Cyanobacteriaceae: Cyanophyceae) isolated from the eastern Indian Ocean

One strain of unicellular greenish algae embedded by mucilage was successfully isolated from equatorial area in the Indian Ocean. Microscopic observation, ultrastructure features and genetic identification confirmed that the strain was closely related to Cyanothece sp., which was a cyanobacteria spe...

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Bibliographic Details
Published in:Acta oceanologica Sinica 2018-10, Vol.37 (10), p.4-10
Main Authors: Zhang, Xiaodong, Yang, Shuang, Sun, Jun, Wu, Chao, Wang, Jing, Zhang, Guicheng, Ding, Changling
Format: Article
Language:English
Subjects:
Algae
Carotene
Cells
Chlorophyll
Chlorophyll a
Climatology
Composition
Cyanobacteria
Cytoplasmic organelles
Earth and Environmental Science
Earth Sciences
Ecology
Engineering Fluid Dynamics
Environmental Chemistry
Equatorial regions
Gene amplification
Glycogen
Glycogens
Granular materials
Marine & Freshwater Sciences
Morphology
Mucilage
Mucilages
NifH gene
Nitrogen
Oceanography
Oceans
Phylogenetics
Phylogeny
Pigments
rRNA 16S
Science
Thylakoids
Ultrastructure
Zeaxanthin
β-Carotene
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Summary:One strain of unicellular greenish algae embedded by mucilage was successfully isolated from equatorial area in the Indian Ocean. Microscopic observation, ultrastructure features and genetic identification confirmed that the strain was closely related to Cyanothece sp., which was a cyanobacteria species with great ecological significance. Cells were solitary with oval or bacilliform shapes. Diameters of this strain were relatively small, ranging from 2.5 to 6.5 μm on average. Ultrastructure of cells was simple. Thylakoids were arranged parietal and keritomized content were observed in the thylakoid region. Various electron-transparent granules with low electron-dense region as well as cyanophycin or glycogen granules-like organelle and carbonxysomes were also observed. For pigment composition, the dominant pigments were chlorophyll a , β-Carotene, Zeaxanthin and an unknown pigment, contributing 23.8%, 26.1%, 14.7% and 15.7% to total pigments respectively. The phylogenetic analysis of 16S rRNA gene and nif H gene confirmed that Strain EIO409 was closely related with Cyanothece sp..
ISSN:0253-505X
1869-1099
DOI:10.1007/s13131-018-1297-y