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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Cadmium induced mitochondrial redox changes in germinating pea seed
BioMetals, Volume 23, No. 6, Year 2010
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Description
Mitochondria play an essential role in producing the energy required for seedling growth following imbibition. Heavy metals, such as cadmium impair mitochondrial functioning in part by altering redox regulation. The activities of two protein redox systems present in mitochondria, thioredoxin (Trx) and glutaredoxin (Grx), were analysed in the cotyledons and embryo of pea (Pisum sativum L.) germinating seeds exposed to toxic Cd concentration. Compared to controls, Cd-treated germinating seeds showed a decrease in total soluble protein content, but an increase in -SH content. Under Cd stress conditions, Grx and glutathione reductase (GR) activities as well as glutathione (GSH) concentrations decreased both in cotyledons and the embryo. Similar results were obtained with the Trx system: Trx and NADPH-dependent thioredoxin reductase (NTR) activities were not stimulated, whereas total NAD(P) contents diminished in the embryo. However, Cd enhanced the levels of all components of the Trx system in the cotyledons. On the other hand, Cd caused a significant increase in oxidative stress parameters such as the redox ratio of coenzymes (oxidized to reduced forms) and NAD(P)H oxidase activities. These results indicate that Cd induces differential redox responses on different seed tissues. We suggest that neither Grx system nor Trx one may improve the redox status of mitochondrial thiols in the embryo of germinating pea seeds exposed to Cd toxicity, but in the cotyledons the contribution of Trx/NTR/NADPH can be established in despite the vulnerability of the coenzyme pools due to enzymatic oxidation. © 2010 Springer Science+Business Media, LLC.
Authors & Co-Authors
Smiri, Moêz
Tunisia, Tunis
University of Carthage
France, Vandoeouvre-les-nancy
Interactions Arbres/micro-organismes Iam
Chaoui, Abdelilah
Tunisia, Tunis
University of Carthage
Rouhier, Nicolas
France, Vandoeouvre-les-nancy
Interactions Arbres/micro-organismes Iam
Kamel, Chibani
France, Vandoeouvre-les-nancy
Interactions Arbres/micro-organismes Iam
Gelhaye, Eric
France, Vandoeouvre-les-nancy
Interactions Arbres/micro-organismes Iam
Jacquot, Jean-Pierre
France, Vandoeouvre-les-nancy
Interactions Arbres/micro-organismes Iam
El Ferjani, Ezzedine
Tunisia, Tunis
University of Carthage
Statistics
Citations: 21
Authors: 7
Affiliations: 2
Identifiers
Doi:
10.1007/s10534-010-9344-y
ISSN:
09660844
Research Areas
Environmental