title: Investigation of arsenic accumulation and tolerance potential of Sesuvium portulacastrum (L.) L.
abstract: Sesuvium portulacastrum (L.) L., a facultative halophyte, is considered a suitable candidate for the phytoremediation of metals. An investigation of As accumulation and tolerance was conducted in Sesuvium plants upon exposure to As(V) (100-1000 μM) for 30 d. Plants demonstrated a good growth even after prolonged exposure (30 d) to high As(V) concentrations (1000 μM) and a significant As accumulation (155 μg g⁻¹ dry weight) with a bioaccumulation factor of more than ten at each concentration. The results of shoot and root dry weight, malondialdehyde accumulation, photosynthetic pigments, and total soluble proteins demonstrated that plants did not experience significant toxicity even at 1000 μM As(V) after 30 d. However, metabolites (total non-protein thiols and cysteine) and enzymes (serine acetyltransferase, cysteine synthase and γ-glutamylcysteine synthetase) of thiol metabolism, in general, remained either unaffected or showed slight decline. Hence, plants tolerated high As(V) concentrations without an involvement of thiol metabolism as a major component. Taken together, the results indicate that plants are potential As accumulator and may find application in the re-vegetation of As contaminated sites.
authors.affiliation: Bhabha Atomic Research Centre, Trombay, Mumbai, India.
authors.forename: Vinayak H
authors.initials: VH
authors.lastname: Lokhande
authors.forename: Sudhakar
authors.initials: S
authors.lastname: Srivastava
authors.forename: Vikas Y
authors.initials: VY
authors.lastname: Patade
authors.forename: Sanjay
authors.initials: S
authors.lastname: Dwivedi
authors.forename: R D
authors.initials: RD
authors.lastname: Tripathi
authors.forename: T D
authors.initials: TD
authors.lastname: Nikam
authors.forename: P
authors.initials: P
authors.lastname: Suprasanna
mesh_terms: D035722:Aizoaceae / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D001151:Arsenic / Q000032:analysis / Q000378:metabolism* / Q000633:toxicity; D001673:Biodegradation, Environmental; D002274:Carcinogens, Environmental / Q000378:metabolism* / Q000633:toxicity; D007194:India; D008315:Malondialdehyde / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism* / Q000633:toxicity
chemical_list: D002274:Carcinogens, Environmental; D012989:Soil Pollutants; D008315:Malondialdehyde; D001151:Arsenic