Tolypothrix tenuis stress response to nickel
Metal ions are both essential and potentially toxic. The aim of this work was to demonstrate that diazotrophic cyanobacterium Tolypothrix tenuis N°54 can tolerate toxic concentrations of Ni2+ in order to use the biomass in biofilters or as biofertilizer. For this purpose, growth, pigment and protein...
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| Autores principales: | , , , , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_09593993_v23_n6_p833_Storni |
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| Sumario: | Metal ions are both essential and potentially toxic. The aim of this work was to demonstrate that diazotrophic cyanobacterium Tolypothrix tenuis N°54 can tolerate toxic concentrations of Ni2+ in order to use the biomass in biofilters or as biofertilizer. For this purpose, growth, pigment and protein contents and catalase activity of T. tenuis growing in increasing concentrations of Ni2+ ranging from 10-10 to 10 -4 M were assesed. The strain did not grow at Ni2+ concentration of 10-4 M, but at lower concentrations there were no significant differences with the control; it was tolerant at 10-10 and 10-8 M. Nickel concentration of 10-6 M is toxic for this cyanobacterial strain, because dry weight decreased by 30%; allophycocyanin and phycoerythrin decreased by 92% and 98%, respectively and protein content increased by 42%. Chlorophyll a concentration was more than double the control value in 10-10 and 10-8M, but in 10-6M it decreased by 19%. Catalase (E.C. 1.11.1.6) activity doubled the control value in the lowest nickel concentration whereas in 10-8M there was no significant difference with the control and in 10-6, it decreased by 78%. The living biomass of this strain could be used as a step in the bioremediation process in waters contaminated with concentrations of nickel lower than 10-6 M and eventually as a biofertilizer. © 2007 Springer Science+Business Media B.V. |
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