Bioaccumulation and the Effect of Selenate Concentration on Growth and Photosynthetic Pigment Content of Spirulina platensis

Document Type : Original Article

Authors

1 Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Khouzestan, Iran

2 Department of Agronomy and Plant Breeding, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Khouzestan, Iran

Abstract

Selenium (Se) is a necessary microelement for microalgae growth. Moreover, it might directly act and cause a decrease in primary production in microalgae. Nowadays, there is a great focus on preparations of Se-enriched products. In the current study, the effects of various selenate concentrations on Spirulina were evaluated as a primary stage to large-scale production of Se-enriched S. platensis. Zarrouk medium supplemented to investigate the stimulatory/inhibitory effects of selenate on growth at various concentrations. Biomass dry weight and cell mass were measured on OD550. Thereafter, inhibitory and algicidal concentrations were determined. Furthermore, its effects on morphology and changes of some important pigments in response to the metal challenge were investigated, too. While the results showed that at 5 and 10 ppm concentrations growth was supported, the dry weight of microalgae decreased at selenate levels above 50 ppm. Besides, the inhibitory and lethal effects of selenate were at 100 ppm and 300 ppm, respectively. In addition, morphological changes were observed at this concentration. Additionally, chlorophyll, carotenoid, and phycobiliproteins showed a stimulatory effect at 5-50 ppm, 10 ppm, and 10 ppm, respectively. Moreover, Spirulina uses for foods production because some chemicals are unique compounds. Simple cultivation method and high quality of its protein, and no toxic effects, cause its feasibility for large-scale production.

Keywords

References

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Plant, Algae, and Environment
Volume 5, Issue 1
2021
Pages 624-641

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