Mercury toxicity to Chlorella vulgaris Beijerinck: protection by amino acids

• Autorzy: Mohanty L. , Mohapatra D.K. , Mohapatra P.K. , Mohanty R.C.
• Języki publikacji: EN

Abstrakty

EN

Mercury is known to be toxic to a number of phytoplankton even at very low concentrations. The metal inhibited survival, growth and biosynthesis of chlorophyll, carbohydrate and lipid of the green alga Chlorella vulgaris at its toxic concentrations (≥ 0.1 μM), but induced the biosynthesis of proline. The addition of amino acids (Alanine, Aspargine, Glutamate, Histidine and Cysteine) to the growth medium had a significant impact on bioassay results. The toxicity was expressed differently depending on concentration and type of amino acid added to cultures. LC50s ranged from 0.68 ± 0.004 to 0.97 ± 0.008 μM and the acute toxicity of Hg2+ in amino acid supplemented media followed the order C > C + ALA > C + GLU > C + ASP > C + HIS > C + CYS. The static dose of the metal to the alga was found to be 1 + 0.006 μM but its inhibitory effect on the alga was drastically reduced with the addition of amino acids. There were positive correlations between growth and metabolic activities of the alga and concentration of amino acid added to cultures at the presence of static concentration of Hg2+. The results suggested that amino acids have moderating effects on toxicity of Hg2+ because of their ability to regulate the concentration of free Hg2+ ions in growth medium.

Słowa kluczowe

EN

mercury; toxicity; protection; Chlorella vulgaris; amino acid; growth; survival

• Wydawca: -
• Czasopismo: Polish Journal of Environmental Studies
• Rocznik: 1998
• Tom: 07
• Numer: 1
• Opis fizyczny: p.21-25,ref.

Twórcy

autor

Mohanty L.

• Utkal University, Bhubaneswar-751004, India

autor

Mohapatra D.K.

autor

Mohapatra P.K.

autor

Mohanty R.C.