Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/3295
Title: Zn phytotoxicity induces oxidative stress in primary leaves of Phaseolus vulgaris
Authors: Weckx, Jolanda
CLIJSTERS, Herman 
Issue Date: 1997
Publisher: GAUTHIER-VILLARS
Source: PLANT PHYSIOLOGY AND BIOCHEMISTRY, 35(5). p. 405-410
Abstract: We studied the sequence of several metabolic reactions representative for oxidative damage and protection in primary leaves of Phaseolus vulgaris (cv. Limburgse vroege) after root uptake of a toxic sublethal amount of Zn. An immediate increase of membrane peroxidation products was observed as soon as Zn was assimilated by the primary leaf. This rise could be explained by activation of the enzyme lipoxygenase (EC 1.13.11.12). In our experimental conditions, membrane lipid peroxidation and K+-leakage were not directly related. Zn treatment had no effect on the capacity of catalase (EC 1.11.1.6) and superoxide dismutase (EC 1.15.1.1), while the capacity of ascorbate peroxidase (EC 1.11.1.11) was increased. Zn toxicity further leads to enhanced levels of hydrogen peroxide which could not be efficiently removed by the antioxidative system. Therefore, it seems that an excess of Zn can cause oxidative damage.
Notes: LIMBURGS UNIV CTR,DEPT SBG,LAB BOT,B-3590 DIEPENBEEK,BELGIUM.
Keywords: defense mechanisms; hydrogen peroxide; lipid peroxidation; membrane permeability; oxidative damage; zinc toxicity; Phaseolus vulgaris
Document URI: http://hdl.handle.net/1942/3295
ISI #: A1997XA38500010
Type: Journal Contribution
Appears in Collections:Research publications

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