Impact of zinc on dehydration and rehydration responses in tea
Upadhyaya, H. | Dutta, B. K. | Panda, S. K.
Zinc nutrition of tea (Camelia sinensis) have a great impact on acclimation to dehydration stress and on improvement of stress recovery. Dehydration stress induced by withholding water for 7 d decreased relative water content, dry mass of leaf, and content of antioxidants like ascorbate and glutathione and increased H₂O₂ content and lipid peroxidation and changed activities of superoxide dismutase, catalase, peroxidase, and glutathione reductase. A pre-treatment with 0.1 and 0.5 mM ZnSO₄ minimized these effects and increased Zn uptake. Further, foliar spray with 0.1 and 0.5 mM ZnSO₄ before rehydration lowered H₂O₂ generation, increased content of antioxidants and activities of antioxidative enzymes, and decreased lipid peroxidation. The present findings suggest that zinc regulates water stress responses and recovery after rehydration in tea.
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