Antioxidative enzymes activity of Chlorella vulgaris (UMT-M1) in response to IC50 of Pb2+ and Hg2+
Heavy metals accumulation in aquatic bodies will lead to many deleterious effects on organisms living in them. Furthermore, some organisms can accumulate metals and this will eventually reach the primary consumers. The application of microalgae as remediator and indicator of metals pollution has b...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Penerbit Universiti Kebangsaan Malaysia
2020
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| Online Access: | http://journalarticle.ukm.my/17223/1/49_04_08.pdf http://journalarticle.ukm.my/17223/ http://www.mabjournal.com/index.php?option=com_content&view=article&id=1070&catid=59:current-view&Itemid=56 |
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| Summary: | Heavy metals accumulation in aquatic bodies will lead to many deleterious effects on organisms living in them. Furthermore,
some organisms can accumulate metals and this will eventually reach the primary consumers. The application of microalgae
as remediator and indicator of metals pollution has become an increasing interest to scientists. In this study, we reported on
the defence responses of a marine microalga, Chlorella vulgaris (UMT-M1) against Pb2+ and Hg2+ in terms of three
antioxidative enzymes activity: superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX). The activity
of the enzymes was measured in alga treated with 5.7 mg/L PbCl2 and 0.18 mg/L Hg(NO3)2. These two concentrations were
the IC50 values calculated using probit analysis. It was observed that Pb2+ and Hg2+ triggered a different strategy in
counterattacking the metal’s effects. While a significant induction of SOD and CAT activity was evident in alga treated with
both metals, APX activity was significantly inhibited in Pb2+-treated alga but was stimulated by more than 4-fold from the
control in Hg2+-treated alga. Higher SOD activity was observed in Pb2+- compared to Hg2+-treated alga. However, lower
CAT activity was observed in Pb2+- compared to Hg2+-treated alga. Also, a significant reduction in total soluble protein
(TSP) content was observed in alga treated with Hg2+. Pb2+, on the other hand, significantly increased the production of
TSP. The changes observed in the antioxidative enzymes activity and TSP content in this alga are good potentials to be used
as biomarkers for metal’s bioindication tool. |
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