Glutathione in adaptation of Arabidopsis thaliana to cadmium stress
Wojcik, M.,Maria Curie-Sklodowska Univ., Lublin (Poland). Dept. of Plant Physiology | Tukiendorf, A.,Maria Curie-Sklodowska Univ., Lublin (Poland). Dept. of Plant Physiology
The role of glutathione (GSH) in the adaptation of wild type Arabidopsis thaliana plants to Cd stress was investigated. The nutrient solution (control or containing 50 or 100 microM Cd) was supplemented with buthionine sulfoximine (BSO; 50, 100, 500 microM) to decrease the GSH content in plants or GSH (50, 100, 500 microM) to increase its content in plants in order to find how GSH content could regulate Cd stress responses. BSO application did not influence plant biomass, while exogenous GSH (especially 500 microM) reduced root biomass. BSO (500 microM) in combination with Cd (100 microM) increased Cd toxicity on root growth (by over 50 %), most probably due to reduced GSH content and phytochelatin (PC) accumulation (by over 96 %). On the other hand, combination of exogenous GSH (500 microM) with Cd (100 microM) was also more toxic to plants than Cd alone despite a significant increase in GSH and PC accumulation (up to 2.7 fold in the roots). This fact could indicate that the natural content of endogenous GSH in wild type A. thaliana plants is sufficient for Cd-tolerance. A decrease in this GSH content led to decreased Cd-tolerance of the plants but an increase in GSH content did not enhance Cd-tolerance, and it showed even toxic effects on the plants.
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