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Lead bioaccumulation potential of an aquatic macrophyte Najas indica are related to antioxidant system.

Abstract：

:Plants of Najas indica bioaccumulated significantly higher amounts of Pb (3554 microg g(-1) dw) when, exposed to varying concentrations of Pb(NO(3))(2).This also led to increased malondialdehyde (MDA), electrical conductivity (EC) and H(2)O(2) content. In response to this, the activities of antioxidant enzymes such as superoxide dismutase (SOD), ascorbate peroxidase (APX), guaiacol peroxidase (GPX), catalase (CAT) and glutathione reductase (GR) were elevated along with the induction of various molecular antioxidants including GSH, cysteine, ascorbic acid and proline. Further, Pb exposed plants showed significantly increased cysteine synthase and glutathione-S-transferase activity. Visible symptoms of toxicity were evident at 50 microM after 4d showing chlorosis and fragmentation of leaves with mucilaginous discharge. It seems that bioaccumulated Pb is efficiently tolerated by Najas plants through activation of antioxidant system and thiolic pathways which was evident by the increased biomass up to 10 microM Pb. Therefore, it appears that due to metal tolerance characteristics with high concentration factor these plants can find use in phytoremediation of aquatic system highly contaminated by Pb.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Singh R,Tripathi RD,Dwivedi S,Kumar A,Trivedi PK,Chakrabarty D

doi

10.1016/j.biortech.2009.12.031

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

3025-32

issue

9

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(09)01659-9

journal_volume

101

pub_type

杂志文章

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