Contribution of phytochelatins to cadmium tolerance in peanut plants
| Autor: | Stella Castro, Eliana Bianucci, Luis E. Hernández, Ramón O. Carpena-Ruiz, María del Carmen Tordable, Adriana Fabra, Juan Sobrino-Plata |
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| Rok vydání: | 2012 |
| Předmět: |
Arachis
Biophysics chemistry.chemical_element Metal toxicity medicine.disease_cause Biochemistry Plant Roots Biomaterials Metal chemistry.chemical_compound medicine Phytochelatins Sulfhydryl Compounds Hydrogen peroxide Cadmium Metals and Alloys food and beverages Glutathione Oxidative Stress chemistry Chemistry (miscellaneous) Environmental chemistry Chlorophyll visual_art visual_art.visual_art_medium Endodermis Oxidative stress |
| Zdroj: | Metallomics : integrated biometal science. 4(10) |
| ISSN: | 1756-591X |
| Popis: | Cadmium (Cd) is a well known heavy metal considered as one of the most toxic metals on Earth, affecting all viable cells that are exposed even at low concentration. It is introduced to agricultural soils mainly by phosphate fertilizers and causes many toxic symptoms in cells. Phytochelatins (PCs) are non-protein thiols which are involved in oxidative stress protection and are strongly induced by Cd. In this work, we analyzed metal toxicity as well as PCs implication on protection of peanut plants exposed to Cd. Results showed that Cd exposure induced a reduction of peanut growth and produced changes in the histological structure with a deposit of unknown material on the epidermal and endodermal cells. When plants were exposed to 10 μM Cd, no modification of chlorophyll, lipid peroxides, carbonyl groups, or hydrogen peroxide (H2O2) content was observed. At this concentration, peanut leaves and roots glutathione (GSH) content decreased. However, peanut roots were able to synthesize different types of PCs (PC2, PC3, PC4). In conclusion, PC synthesis could prevent metal disturbance on cellular redox balance, avoiding oxidative damage to macromolecules. |
| Databáze: | OpenAIRE |
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