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 AJPS  Vol.5 No.10 , May 2014
Responses of Marsilea minuta L. to Cadmium Stress and Assessment of Some Oxidative Biomarkers
Kingsuk Das, Chiranjib Mandal, Nirmalya Ghosh, Narottam Dey, Malay Kumar Adak*
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Abstract: In a hydroponic based experiment, the Cd toxicity is monitored with some cellular responses of Marsilea plant. Initially, plants were grown under varying concentrations (0, 50, 100 and 200 μM of Cd) of cadmium (Cd) with supplementation of 2 mM spermidine (Spd). The oxidative stress developed by Cd overaccumulation was measured with fall in Relative Growth Rate (RGR) by 27.11% to 59.83% growth reduction over control under varying Cd treatments. The retrieval of RGR was recovered by 1.59 folds as compared to the highest concentration of Cd (200 μM) when plants were fed with Spd. A concomitant degradation of chlorophyll was recorded in dose-dependant manner, however, the retrieval was not much pronounced with Spd. On the contrary, the non-oxidant thiol had borne more clarity with ongoing Cd concentration and appeared to be 40.51% increase maximally for GSH: GSSG at the highest concentration of Cd. Spd has minimized the ratio by 27.4%. The recovery of osmotic turgidity was indexed with a sharp rise in glycine betaine by 3.86 folds maximum at the highest concentration of Cd over control which declined by 30.9% with Spd. Another cellular response of treated plants was more evident from their isozymic profiles with regard to superoxide dismutase (SOD), catalase (CAT), guaiacol peroxidase (GPX). The intensity of protein expression was significantly variable but not in band numbers as evident from Cd treated plants. In vitro enzyme assay of catalase showed as declining trend within the limit of 33.13% to 43.22% which was reported by 1.45 folds when Spd was applied. Therefore, from the present study, the cellular responses of Marsilea plant which showed compatibility for their expression with Cd toxicity could be hypothesized as a case of bioindication.
Keywords: Cadmium Toxicity, Marsilea minuta, Bioindicators
Cite this paper: Das, K. , Mandal, C. , Ghosh, N. , Dey, N. and Adak, M. (2014) Responses of Marsilea minuta L. to Cadmium Stress and Assessment of Some Oxidative Biomarkers. American Journal of Plant Sciences, 5, 1467-1476. doi: 10.4236/ajps.2014.510162.
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