Response of antioxidant enzymes, ascorbate and glutathione metabolism towards cadmium in hyperaccumulator and nonhyperaccumulator ecotypes of Sedum alfredii H

Environmental Toxicology
Xiao-Fen JinHong Li

Abstract

Hydroponics studies were conducted to investigate the antioxidant adaptations, ascorbate and glutathione metabolism in hyperaccumulating ecotype of Sedum alfredii (HE) exposed to high Cd environment, when compared with its nonhyperaccumulating ecotype (NHE). Exposure to Cd induced a burst of oxidative stress in both ecotypes which was evident by the sharp increase in hydrogen peroxide (H(2)O(2)) contents and lipid peroxidation. Buthionine sulfoximine (BSO), an inhibitor of glutathione (GSH) synthesis, did not affect H(2)O(2) concentrations as well as growth of both ecotypes in the absence of Cd. However, compared with Cd application alone, BSO combined with Cd treatment caused a substantial augmentation of H(2)O(2) accumulation accompanied by a reduction in Cd concentrations in roots and leaves of HE at the end of treatment, which may rule out the possibility that GSH biosynthesis may play an important role as a signal of the stress regulation. No efficient and superior enzymatic antioxidant defense mechanisms against Cd-imposed oxidative stress existed in both NHE and HE, but the essential nonenzymatic components like ascorbic acid (AsA) and GSH played a prominent role in tolerance against Cd. Cadmium stimulated a notable rise...Continue Reading

References

Jan 26, 1971·Biochimica Et Biophysica Acta·D D Perrin, A E Watt
Sep 30, 1998·Proceedings of the National Academy of Sciences of the United States of America·M J MayD Inzé
Sep 27, 2000·Critical Reviews in Biochemistry and Molecular Biology·N Smirnoff, G L Wheeler
Nov 18, 2000·The Journal of Biological Chemistry·K VidoJ Labarre
Sep 18, 2002·Trends in Plant Science·Ron Mittler
May 28, 2003·Biotechnology and Bioengineering·Rengasamy Boominathan, Pauline M Doran
Mar 12, 2004·Annual Review of Plant Physiology and Plant Molecular Biology·Graham Noctor, Christine H. Foyer
Apr 12, 2005·Plant Physiology and Biochemistry : PPB·Parameswaran Aravind, Majeti Narasimha Vara Prasad
Feb 1, 1977·Plant Physiology·C N Giannopolitis, S K Ries
Aug 1, 1990·Plant Physiology·A RüegseggerC Brunold
Jun 23, 2006·Annals of Botany·Nina Fedoroff
Jul 4, 2007·Environmental Toxicology·Prashant MohanpuriaSudesh Kumar Yadav

❮ Previous
Next ❯

Citations

Mar 30, 2013·Journal of Plant Physiology·Sónia SilvaConceição Santos
Apr 9, 2013·Environmental Toxicology and Chemistry·Zhouli LiuMingzhu Zhao
Nov 19, 2013·Ecotoxicology and Environmental Safety·Jun LiangZhenli He
Aug 30, 2014·Environmental Science and Pollution Research International·Antonella CastagnaRoberto Tognetti

❮ Previous
Next ❯

Related Concepts

Related Feeds

Bioremediation (ASM)

Bioremediation is the treatment and removal of harmful pollutants or contaminants through the use of microorganisms. Discover the latest research here.