Abstract
With the boom in industrialization, there is an increase in the level of heavy metals in the soil which drastically affect the growth and development of plants. Nickel is an essential micronutrient for plant growth and development, but elevated level of Ni causes stunted growth, chlorosis, nutrient imbalance, and alterations in the defense mechanism of plants in terms of accumulation of osmolytes or change in enzyme activities like guiacol peroxidase (POD), catalase (CAT), and superoxide dismutase (SOD). Ni-induced toxic response was studied in seedlings of finger millet, pearl millet, and oats in terms of seedling growth, lipid peroxidation, total chlorophyll, proline content, and enzymatic activities. On the basis of germination and growth parameters of the seedling, finger millet was found to be the most tolerant. Nickel accumulation was markedly lower in the shoots as compared to the roots, which was the highest in finger millet and the lowest in shoots of oats. Plants treated with a high concentration of Ni showed significant reduction in chlorophyll and increase in proline content. Considerable difference in level of malondialdehyde (MDA) content and activity of antioxidative enzymes indicates generation of redox imbalance in plants due to Ni-induced stress. Elevated activities of POD and SOD were observed with high concentrations of Ni while CAT activity was found to be reduced. It was observed that finger millet has higher capability to maintain homeostasis by keeping the balance between accumulation and ROS scavenging system than pearl millet and oats. The data provide insight into the physiological and biochemical changes in plants adapted to survive in Ni-rich environment. This study will help in selecting the more suitable crop species to be grown on Ni-rich soils.
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The authors are grateful to the Council of Scientific and Industrial Research (CSIR), the Indian Council of Medical Research (ICMR), and the Rajiv Gandhi National Fellowship (RGNF) for financial support. We also express sincere thanks to DBT-IPLS facility and DRS Phase II, Department of Botany, University of Rajasthan, for providing research facilities.
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Gupta, V., Jatav, P.K., Verma, R. et al. Nickel accumulation and its effect on growth, physiological and biochemical parameters in millets and oats. Environ Sci Pollut Res 24, 23915–23925 (2017). https://doi.org/10.1007/s11356-017-0057-4
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DOI: https://doi.org/10.1007/s11356-017-0057-4