biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 56:344-350, 2012 | DOI: 10.1007/s10535-012-0096-0

Root adaptations to cadmium-induced oxidative stress contribute to Cd tolerance in the hyperaccumulator Sedum alfredii

S. K. Tian1, L. L. Lu1,*, X. E. Yang1,*, H. G. Huang1, K. Wang1, P. H. Brown2
1 MOE Key Laboratory of Environment Remediation and Ecosystem Health, Zhejiang University T]Huajiachi Campus, Hangzhou, China
2 Department of Plant Sciences, University of California, Davis, USA

Short-term responses of Sedum alfredii roots to Cd exposure was compared in Cd hyperaccumulator (HE) and nonhyperaccumulating ecotype (NHE). Cadmium exposure significantly inhibited root elongation and induced loss of plasma membrane integrity and lipid peroxidation of roots tips in the NHE, whereas these effects were much less pronounced in the HE plants. A strong accumulation of reactive oxygen species with increasing Cd concentration was noted in the NHE root tips, but not in HE. After Cd exposure, a dose-dependent decrease in oxidized glutathione and marked increase in reduced glutathione and non-protein thiols were observed in root tips of HE, but were not seen in the NHE plants. These results suggest that the HE tolerates high Cd in the environment through the differential adaptations against Cd-induced oxidative stress.

Keywords: glutathione; hydrogen peroxide; lipid peroxidation; membrane integrity; reactive oxygen species
Subjects: glutathione; hydrogen peroxide; lipid peroxidation; membrane integrity; reactive oxygen species; cadmium; hyperaccumulator; malondialdehyde

Received: December 8, 2010; Accepted: March 9, 2011; Published: June 1, 2012  Show citation

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Tian, S.K., Lu, L.L., Yang, X.E., Huang, H.G., Wang, K., & Brown, P.H. (2012). Root adaptations to cadmium-induced oxidative stress contribute to Cd tolerance in the hyperaccumulator Sedum alfredii. Biologia plantarum, 56(2), 344-350. doi: 10.1007/s10535-012-0096-0
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