Vitamin E (α-tocopherol) production by the marine microalgae Dunaliella tertiolecta and Tetraselmis suecica in batch cultivation

The main ultrastructural and physiological changes in cells of Dunaliella tertiolecta, Pavlova lutheri, and Amphidinium carterae treated with selenite or selenate involved the mitochondria and chloroplasts as well as the respiratory and photosynthetic rates. Other changes were observed in the nucleus, lipids, vacuoles, and nitrogen and carbon contents, but these showed greater variability among the microalgae studied. The major alterations suggested that energy-transducing systems were severely affected by selenium toxicity. These led to significant decreases or even elimination of storage products and major reductions in growth.

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Effects of Selenite and Selenate on the Growth and Motility of Seven Species of Marine Microalgae

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f91-144 ◽

1991 ◽

Vol 48 (7) ◽

pp. 1193-1200 ◽

Cited By ~ 23

Author(s):

Donald Wong ◽

Luis Olivesra

Keyword(s):

Molecular Species ◽

Swimming Speed ◽

Marine Microalgae ◽

Dunaliella Tertiolecta ◽

Severe Toxicity ◽

Pavlova Lutheri ◽

Motile Cells ◽

High Selenium ◽

High Concentrations ◽

Toxic Responses

Seven species of marine phytoplankters from different taxonomic divisions were tested for toxic responses to two different molecular species of selenium known to be prevalent in seawater, selenite and selenate. Selenate was slightly more toxic, although severe toxicity was only observed at high concentrations (selenate, 10−2 M; selenite, 10−3 M). At these concentrations, growth was completely or severely inhibited in most species tested. ln some species that remained viable, both the percentage of motile cells and their swimming speed were drastically reduced. These cells possessed much shorter flagella compared with controls, while nonmotile cells lacked flagella altogether. Despite such striking alterations, cells of Amphidinium carterae, Dunaliella tertiolecta, and Pavlova lutheri showed signs of adaptation to high selenium concentrations. Lower concentrations of selenium were generally nontoxic and frequently stimulated growth. These observations suggest that both the concentration range and the length of the exposure must be considered if meaningful inferences on selenium toxicity are to be made.

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The diverse toxic effect of SiO2 and TiO2 nanoparticles toward the marine microalgae Dunaliella tertiolecta

Environmental Science and Pollution Research ◽

10.1007/s11356-015-4790-2 ◽

2015 ◽

Vol 22 (20) ◽

pp. 15941-15951 ◽

Cited By ~ 34

Author(s):

S. Manzo ◽

S. Buono ◽

G. Rametta ◽

M. Miglietta ◽

S. Schiavo ◽

...

Keyword(s):

Toxic Effect ◽

Tio2 Nanoparticles ◽

Marine Microalgae ◽

Dunaliella Tertiolecta

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Nanoparticles based sunscreens provoke adverse effects on marine microalgae Dunaliella tertiolecta

Environmental Science Nano ◽

10.1039/c8en01182f ◽

2018 ◽

Vol 5 (12) ◽

pp. 3011-3022 ◽

Cited By ~ 5

Author(s):

Simona Schiavo ◽

Maria Oliviero ◽

Allan Philippe ◽

Sonia Manzo

Keyword(s):

Adverse Effects ◽

Zno Nanoparticles ◽

Coastal Ecosystems ◽

Marine Microalgae ◽

Dunaliella Tertiolecta ◽

Summer Period

Sunscreens represent one of the main sources of engineered TiO2 and ZnO nanoparticles (NPs) in coastal ecosystems, especially during the summer period.

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