Year: 2018 | Month: February | Volume 11 | Issue 1
Vigna radiata: A Potent Phytofiltrator of Lead Grown Hydroponically in Sewage
Abstract:
Phytofiltration is an ecofriendly technique, which use plants biomass to remove toxic heavy metals from aqueous waste. Lead (Pb) present in sewage induces oxidative stress and cause deleterious effects on living organism, hence it has to be removed. The aim of the study is to evaluate efficiency of Vigna radiata as phytofiltrator of lead. The efficiency was estimated in terms of growth attributes, stress marker and accumulated lead content of V. radiata. In the present experimental design, Vigna radiata (Mungbean) plants were grown hydroponically in sewage and 50% diluted sewage for 15-days. V. radiata grown in Hoagland media served as the control. Accumulated lead content was estimated by Atomic absorption spectroscopy. It was observed that, total height, fresh and dry weight of V. radiata was not changed significantly (p>0.05) in sewage as compared to control. Reduction in total height was significant (p<0.05) and fresh and dry weight was highly significant (p<0.01) in 50% sewage. Lead accumulation was observed in V. radiata grown using sewage. Malondialdehyde (MDA), peroxidase, and proline content increased significantly (p<0.05) in sewage when compared to control. In 50% diluted sewage, malondialdehyde, peroxidase reduced significantly (p<0.05), while proline content showed a significant increase (p<0.01) when compared to undiluted sewage. It was concluded that V. radiata has potential to phytofilter lead from sewage. Increased MDA level indicates oxidative stress. Increased antioxidative stress markers; proline and peroxidase activity shows that V. radiata has tolerance to lead stress. Use of 50% diluted sewage is effective in reducing oxidative stress but it also negatively affects plant growth when compared to undiluted sewage.
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