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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Cadmium- and barium-toxicity effects on growth and antioxidant capacity of soybean (Glycine max L.) plants, grown in two soil types with different physicochemical properties

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Author(s):
Azevedo Melo, Leonidas Carrijo [1] ; Ferracciu Alleoni, Luis Reynaldo [1] ; Carvalho, Giselle [2] ; Azevedo, Ricardo Antunes [2]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, ESALQ, Dept Soil Sci, BR-13418900 Sao Paulo - Brazil
[2] Univ Sao Paulo, ESALQ, Dept Genet, BR-13418900 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE; v. 174, n. 5, p. 847-859, OCT 2011.
Web of Science Citations: 25
Abstract

The pollution of agricultural soils by metals is of growing concern worldwide, and is increasingly subject to regulatory limits. However, the effect of metal pollutants on the responses of plants can vary with soil types. In this study, we examined the growth and antioxidant responses of soybean plants exposed to contrasting soils (Oxisol and Entisol), which were artificially contaminated with cadmium (Cd) or barium (Ba). Cadmium reduced plant growth at concentrations higher than 5.2 mg (kg soil)(-1), while Ba only affected plant growth at 600 mgkg(-1). Such levels are higher than the limits imposed by the Brazilian environmental legislation. Lipid peroxidation was increased only at a Cd concentration of 10.4 mgkg(-1) in the Oxisol, after 30 d of exposure. Twelve superoxide dismutase (SOD; EC 1.15.1.1) isoenzymes were evaluated, most of which were classified as Cu/Zn forms. The SOD activity in the leaves of plants grown in the Oxisol decreased over time, whilst remaining high in the Entisol. Catalase (CAT; EC 1.11.1.6) activity in the leaves exhibited little response to Cd or Ba, but increased over time. Glutathione reductase (GR; EC 1.6.4.2) activity was reduced over time when exposed to the higher Cd concentrations, but increased following Ba exposure in the Oxisol. The enzyme-activity changes were mainly dependent on soil type, time of exposure and, to a lesser extent, the metal concentration of the soil. Soybean plants grown in a sandy soil with a low buffering capacity, such as Entisol, suffer greater oxidative stress than those grown in a clay soil, such as Oxisol. (AU)

FAPESP's process: 07/56350-9 - Phytotoxicity of cadmium and barium and derivation of critical limits in São Paulo State soils
Grantee:Leônidas Carrijo Azevedo Melo
Support Opportunities: Scholarships in Brazil - Doctorate