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Cadmium‐induced oxidative stress and protection by L‐Galactono‐1, 4‐lactone in winter wheat ( Triticum aestivum L. )
Author(s) -
Zhao Zhongqiu,
Cai Yunlong,
Zhu Yongguan,
Kneer Ralf
Publication year - 2005
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/jpln.200520513
Subject(s) - malondialdehyde , lipid peroxidation , oxidative stress , cadmium , chemistry , reactive oxygen species , hydrogen peroxide , peroxidase , antioxidant , shoot , membrane permeability , biochemistry , oxidative phosphorylation , catalase , gall , botany , biology , membrane , enzyme , organic chemistry
Two hydroponic culture experiments were conducted to investigate cadmium (Cd)‐induced oxidative stress in winter wheat ( Triticum aestivum L . ) seedlings and the effects of L‐Galactono‐1, 4‐lactone (GalL), the biosynthetic precursor of the antioxidant ascorbate (AsA), on the oxidative stress induced by Cd. In experiment 1, with application of Cd (0, 10, 25, 50 µM) in nutrient solution, hydrogen peroxide (H 2 O 2 ) and malondialdehyde (MDA) levels as well as membrane permeability in both shoots and roots were significantly increased, indicating Cd‐induced oxidative stress and lipid peroxidation as well as plasma‐membrane damage in the plants. In experiment 2, H 2 O 2 levels in plants exposed to Cd were significantly reduced by the addition of GalL (25 mM), associated with increased activities of peroxidase (POD), indicating that GalL alleviated the oxidative stress induced by Cd. Unexpectedly, however, the MDA levels were not reduced by the addition of GalL. Does Cd also induce lipid peroxidation directly besides via formation of reactive oxygen species (ROS)? This needs further study.