Journal
ACTA OCEANOLOGICA SINICA
Volume 37, Issue 10, Pages 4-10Publisher
SPRINGER
DOI: 10.1007/s13131-018-1297-y
Keywords
Cyanothece; cyanobacteria; morphology; 16S rRNA gene; nifH gene; Indian Ocean
Categories
Funding
- National Natural Science Foundation of China [41876134, 41676112, 41276124, 41406155, 41506182]
- Natural Science Foundation of Tianjin [17JCZDJC40000]
- Exploration Program of Ocean with Science and Technology of Tianjin [KJXH2013-22]
- Changjiang Scholar Program of Chinese Ministry of Education of China
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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 m 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, -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 nifH gene confirmed that Strain EIO409 was closely related with Cyanothece sp..
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