NDLI: Cadmium induced oxidative stress in soybean plants also by the accumulation of δ-aminolevulinic acid

Content Provider	Springer Nature Link
Author	riega, Guillermo O. Balestrasse, Karina B. Batlle, Alcira Tomaro, Maria L.
Copyright Year	2007
Abstract	Cadmium toxicity has been extensively studied in plants, however its biochemical mechanism of action has not yet been well established. To fulfil this objective, four-weeks-old soybean nodulated plants were treated with 200 μM Cd2+ for 48 h. δ-aminolevulinic acid dehydratase (ALA-D, E.C. 4.2.1.24) activity and protein expression, as well as δ-aminolevulinic acid (ALA) and porphobilinogen (PBG) concentrations were determined in nodules, roots and leaves. In vitro experiments carried out in leaves were performed using leaf discs to evaluate the oxidant and antioxidant properties of ALA and S-adenosyl-l-methinone (SAM), respectively. Oxidative stress parameters such as thiobarbituric acid reactive substances (TBARS) and GSH levels as well as superoxide dismutase (SOD, E.C. 1.15.1.1), and guaiacol peroxidase (GPOX, E.C. 1.11.1.7) were also determined. Cadmium treatment caused 100% inhibition of ALA-D activity in roots and leaves, and 72% inhibition in nodules whereas protein expression remained unaltered in the three studied tissues. Plants accumulated ALA in nodules (46%), roots (2.5-fold) and leaves (104%), respect to controls. From in vitro experiments using leaf discs, exposed to ALA or Cd2+, it was found that TBARS levels were enhanced, while GSH content and SOD and GPOX activities and expressions were diminished. The protective role of SAM against oxidative stress generated by Cd2+ and ALA was also demonstrated. Data presented in this paper let us to suggest that accumulation of ALA in nodules, roots and leaves of soybean plants due to treatment with Cd2+ is highly responsible for oxidative stress generation in these tissues.
Starting Page	841
Ending Page	851
Page Count	11
File Format	PDF
ISSN	09660844
Journal	BioMetals
Volume Number	20
Issue Number	6
e-ISSN	15728773
Language	English
Publisher	Springer US
Publisher Date	2007-01-10
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	δ-Aminolevulinic acid δ-Aminolevulinic acid dehydratase Cadmium Oxidative stress Soybean Physical Chemistry Biochemistry
Content Type	Text
Resource Type	Article
Subject	Metals and Alloys Biochemistry, Genetics and Molecular Biology Biomaterials Agricultural and Biological Sciences

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