ISOZYME PATTERN OF ANTIOXIDANT ENZYMES AND DNA DAMAGE IN OCTOBLEPHARUM ALBIDUM HEDW. A BRYOPHYTE IN RESPONSES TO CADMIUM AND COPPER STRESS
Journal Title: Journal of Biological and Scientific Opinion - Year 2015, Vol 3, Issue 1
Abstract
Bryophytes are the amphibians of the plant world adapted morphologically and physiologically to overcome a plethora of environmental stress. The objective of the present study is to analyze isozyme pattern of antioxidant enzymes, DNA damage, pigments, ultra structural changes of chloroplast and mitochondria associated with the heavy metals cadmium and copper in Octoblepharum albidum a Bryophyte. Plants exposed at normal condition were treated as control whereas, experimental samples comprise moss treated with different concentrations of cadmium / copper (0.25, 0.5, 1, 1.5 and 2 mg/L in growth chambers). Variation in the pigment composition coupled with low chlorophyll to carotenoids ratio suggests the optimal photo protective adaptation in the moss. Isozymes of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), guaiacol-peroxidase (POX) showed either an increase in intensity or new isozymes. Ultra structure of chloroplast remained unaltered in metal treated leaves. Meanwhile, mitochondria showed marginal deformities. DNA damage was marginal in the initial concentrations as revealed by comet assay. Thus, the results revealed antioxidant defense mechanisms in O. albidum against the heavy metal tolerance in terms of isozyme pattern of antioxidant enzymes for scavenging the reactive oxygen species formed in the cells; antioxidant defense mechanisms in O. albidum against the heavy metal tolerance.
Authors and Affiliations
Aswathy J M, Greeshma G M, Meenu V G, Murugan K
Keywords
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- EP ID EP111190
- DOI 10.7897/2321-6328.0313
- Views 91
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