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Oxidative stress and potential biomarkers in tomato seedlings subjected to soil lead contamination.

Abstract：

:Oxidative stress and defense response in leaves of tomato seedlings exposed to extraneous lead (Pb) at 0-500 mg kg(-1) soil for nearly 2 months were investigated. Superoxide radical (O(2)(-)) was quantified by electron paramagnetic resonance (EPR). Results showed that levels of O(2)(-), malondialdehyde (MDA), carbonyl group and superoxide dismutase (SOD) increased with the increase of bioavailable Pb. The O(2)(-) level was well correlated with MDA, carbonyl groups and SOD activities, suggesting that O(2)(-) might be responsible for them. Intensities in two bands of SOD isoenzymes increased along with added Pb in treatments against control, implying that multigenic expression in SOD enzymes were activated to counteract O(2)(-) stress. Heat shock protein 70 (HSP70) was induced sensitively by soil Pb, which was to alleviate oxidative damage (i.e. increased carbonyl groups). The overall results indicated that HSP70 and O(2)(-) were the most sensitive parameters and the combination of them might be potential biomarkers of soil Pb contamination in tomato seedlings.

journal_name

Ecotoxicol Environ Saf

journal_title

Ecotoxicology and environmental safety

authors

Wang C,Wang X,Tian Y,Xue Y,Xu X,Sui Y,Yu H

doi

10.1016/j.ecoenv.2008.01.002

subject

Has Abstract

pub_date

2008-11-01 00:00:00

pages

685-91

issue

3

eissn

0147-6513

issn

1090-2414

pii

S0147-6513(08)00004-3

journal_volume

71

pub_type

杂志文章

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