Abstract
The effects of Ni 2+ on Raphanus sativus seeds during the first 48 h of germination were investigated. Increasing concentrations of Ni 2+ (0, 80, 100, 200 and 400 μM) progressively inhibited the growth of radish seedlings. In parallel, Ni 2+ affected the restoration of reabsorption of K + and Mg 2+ and the release of Ca 2+ into the incubation medium. The transport mechanisms appeared to be well operative, as indicated by the negative values of the transmembrane electrical potential. Ni 2+ strongly affected the reactivation of oxygen uptake and the increase in energy charge, the mobilisation of sugar and phospho-organic compounds and inhibited the synthesis of DNA, RNA and proteins. The presence of Ni 2+ retarded the degradative and synthetic changes of protein of the soluble and microsomal fractions, occurring in seeds during germination; moreover, in both the soluble and microsomial fractions, two polypeptides from each were not expressed.
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