engleski

Accumulation of Non/essential Elements in Radish Plants Grown in Salt-affected and Cadmium-contaminated Environment

Soil salinization, as one of the most important abiotic stresses in irrigated plant production, combined with metal contamination represents a serious threat to food production and human food safety. The influence of a factorial combination of four salinity concentrations (0, 20, 40 and 60 mM NaCl added as solution) and three cadmium (Cd) levels (0.3, 2.5 and 5 mg kg(-1)) in peat soil on mineral accumulation, vegetative growth and edible hypocotyl yield of radish plants (Raphanus sativus L. var. sativus) was studied in a greenhouse. After 34 days of exposure to NaCl treatment, salt-stressed plants had a reduced number of fully developed leaves (up to 30%) and total fruit yield (up to 35%) in addition to the progressively increased Na and Cl concentration as well as significantly lower K concentration in leaf and hypocotyl tissues. Salinity significantly increased the uptake and accumulation of Cd in leaves (up to 20%). In contrast, raising salinity levels did not affect the Cd translocation and deposition into the edible hypocotyls (Cd contents being 4- to 6-fold lower than in leaves), which may indicate that the phloem mobility of Cd in radish plants is relatively poor and unaffected by NaCl exposure. Contamination of growing media by Cd (separately and in combination with NaCl salinity) had no effect on any measured parameter, except that accumulation of Cd in radish tissues was increased by an order of magnitude compared with non-contaminated control.

salt stress; metal pollution; phytoaccumulation

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