Publication:
Lead toxicity in plants

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dc.contributor.authorSharma, Pallavi
dc.contributor.authorDubey, Rama Shanker
dc.date.accessioned2025-03-04T05:54:44Z
dc.date.available2025-03-04T05:54:44Z
dc.date.issued2005
dc.description.abstractContamination of soils by heavy metals is of widespread occurrence as a result of human, agricultural and industrial activities. Among heavy metals, lead is a potential pollutant that readily accumulates in soils and sediments. Although lead is not an essential element for plants, it gets easily absorbed and accumulated in different plant parts. Uptake of Pb in plants is regulated by pH, particle size and cation exchange capacity of the soils as well as by root exudation and other physico-chemical parameters. Excess Pb causes a number of toxicity symptoms in plants e.g. stunted growth, chlorosis and blackening of root system. Pb inhibits photosynthesis, upsets mineral nutrition and water balance, changes hormonal status and affects membrane structure and permeability. This review addresses various morphological, physiological and biochemical effects of Pb toxicity and also strategies adopted by plants for Pb-detoxification and developing tolerance to Pb. Mechanisms of Pb-detoxification include sequestration of Pb in the vacuole, phytochelatin synthesis and binding to glutathione and aminoacids etc. Pb tolerance is associated with the capacity of plants to restrict Pb to the cell walls, synthesis of osmolytes and activation of antioxidant defense system. Remediation of soils contaminated with Pb using phytoremediation and rhizofiltration technologies appear to have great potential for cleaning of Pb-contaminated soils.
dc.identifier.doihttps://doi.org/10.1590/s1677-04202005000100004
dc.identifier.issn16770420
dc.identifier.urihttps://dl.bhu.ac.in/ir/handle/123456789/87662
dc.publisherSociedade Brasileira de Fisiologia Vegetal
dc.subjectAntioxidant defense system
dc.subjectDetoxification
dc.subjectLead
dc.subjectOsmolytes
dc.subjectPhytochelatin
dc.subjectPhytoremediation
dc.subjectRhizofiltration
dc.subjectTolerance
dc.subjectToxicity
dc.titleLead toxicity in plants
dc.typeReview
dspace.entity.typePublication
journal.titleBrazilian Journal of Plant Physiology
journalvolume.identifier.volume17

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2005