| Abstrakt: |
Zinc (Zn), the second most abundant transition metal, after iron, is an essential micronutrient for plants. Generally, Zn is considered one of the least toxic heavy metals, but in excess it is toxic to plants, generally by generation of reactive oxygen species and induction of oxidative stress. For these reasons, in this study it was analyzed the impact of short-term Zn treatment on superoxide dismutase, catalase, peroxidase, and on soluble protein content in the seedlings of an autumn six-row Hordeum vulgare L. commercial cultivar, in the early ontogeny. Zn was added as zinc sulphate and zinc acetate at the concentrations of 10 µM, 100 µM, 250 µM, and 500 µM (Zn2+ content: 0.654, 6.54, 16.35, and 32.70 µg ml-1, respectively). Heterogeneous enzymatic responses have been obtained under zinc stress. Soluble protein amounts lowered under Zn action, the inhibitive effect being more marked in older barley plantlets. [ABSTRACT FROM AUTHOR] |
