Abstract
This paper provides information on the effects of toxic concentrations of zinc sulphate (ZnSO 4. 7H 2O) on the growth and metabolism of rice Oryza sativa L. seedlings. Root growth inhibition was always more pronounced than was shoot growth inhibition. Root growth was completely inhibited at 40 m m concentration, whereas the magnitude of reduction of shoot length was only 56% at this concentration. Gibberellic acid (GA 3) was partially capable of relieving zinc inhibition. The activities of peroxidase, IAA oxidase and ascorbic oxidase of seedlings increased in response to zinc addition, whereas catalase and IAA synthetase decreased. All the hydrolysing enzymes, viz., α-amylase and phytase of endosperm together with RNase and ATPase of the embryo, showed distinct inhibition from the control, the exception being endosperm RNase which was stimulated under zinc treatment.
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