Induction of cadmium-binding peptides in sorghum

Pinto, Ana Paula Honrado; Serafim, Angela; Bebianno, Maria; Almeida Mota, Ana Maria

http://hdl.handle.net/10400.1/13885

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Authors

Pinto, Ana Paula Honrado

Serafim, Angela

Bebianno, Maria

Almeida Mota, Ana Maria

Abstract(s)

Hydroponic experiments with sorghum were carried out in nutrient solution medium, under controlled environmental conditions for different periods of time. Cadmium (Cd ) was added at a final concentration of 0.1, 1 and 10 mg dm−3. The effect of time and cadmium concentration on the content of thiolic groups (TSH) in the “cell sap” of sorghum tissues are discussed in relation to plant resistance/tolerance to metal stress. The increase in Cd level in the nutrient solution was associated with a higher total Cd accumulation in the plant (root and shoot), which produced a significant enhancement on the thiolic groups content. Furthermore, higher Cd concentrations in plant tissues induced not only an increase in sulphur-rich compounds but also enhanced the binding capacity of these compounds.