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A Thlaspi caerulescens (J. & C. PRESL) was used to study the effect of cadmium on the content of free amino acids and ability accumulation of Cd in ecotypes of this plant species. In pot experiment two ecotypes T. caerulescens were used: Ganges ecotype from France and Mežica ecotype from Slovenia. The plants were grown in soil (chernozem – Suchdol) spiked with NPK and three different concentration of Cd: 30, 60 and 90 mg/kg. The content of Cd was measured in the above-ground biomass and roots using ICP-OES. Accumulation of Cd was higher in the Mežica ecotype in contrast to the low Cd-accumulating the Ganges ecotype. Analyses of free amino acids contents were measured by GC-MS method. The content of free amino acids in above-ground biomass of the Mežica ecotype declined progressively with increasing concentrations of Cd. Opposite trend was observed in roots of this ecotype. The increase of free amino acids contents in above-ground biomass and roots of the Ganges ecotype were detected. The results of specific amino acids free proline showed increased content in plant biomass with increasing Cd contamination of soil. A statistically significant increase was observed between control plants (0 mg/kg Cd) and variant Cd3 (90 mg/kg Cd) for both ecotypes. The statistically significant decrease of free proline was observed in the Mežica ecotype roots. Opposite trend was observed in roots of Ganges ecotype - increasing trend of free proline content. These results indicate a correlation between content of Cd and content of free proline in different parts of the plant. We can speculate that the mechanism of Cd hyperaccumulation and metabolism of free proline are not identical in ecotypes of this species

Cadmium Induced Changes of Proline in Two Ecotypes ofThlaspi Caerulescens