Understanding the physiology of metal accumulation and detoxification mechanisms in plants is crucial to developing strategy for heavy metal remediation. Evidence suggests that Sesbania drum-mondii uses more than one mechanism to counteract lead toxicity. Pb2+ in Sesbania tissues complexes predominantly with acetate- and sulphur-containing compounds to minimize the toxic effects; however, antioxidative defense mechanisms are also used by this plant effectively to overcome the effects of reactive oxygen species and protect the photosynthetic machinery and efficiency. On the basis of biomass generation capability and physiological backup for tolerance, this plant can be a suitable agent for remediation of lead-contaminated sites.
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