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Cr(VI) Imposed Toxicity in Maize Seedlings Assessed in Terms of Disruption in Carbohydrate Metabolism

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Abstract

The present study examined the toxic effects of Cr(VI; 100, 250 and 500 μM) in maize seedlings by investigating the changes in carbohydrate metabolism after 48, 96, and 144 h of exposure. Cr-stress results in severe alterations in the contents of carbohydrates and reducing sugars and the activities of carbohydrate metabolizing enzymes, amylases, phosphatases and phosphorylases, and invertases in maize seedlings. Under Cr stress, the contents of carbohydrates and reducing sugars declined in roots, whereas an increase was noticed in leaves. The catalytic activity of carbohydrate metabolizing enzymes, except invertases, in roots declined in the presence of Cr(VI) in a concentration- and exposure time-dependent manner. In contrast, the activities of these enzymes were enhanced in leaves under Cr(VI) stress. The activity of invertases increased with increasing amount of Cr(VI) but declined with an increase in the time interval. In conclusion, our results show that carbohydrate metabolism is severely affected under Cr(VI) toxicity. The study suggests that Cr-induced perturbations in the carbohydrate metabolism are one of the factors resulting in growth inhibition under Cr(VI) stress.

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Acknowledgments

Priyanka Mahajan is thankful to Council of Scientific and Industrial Research (New Delhi, India) for financial support in the form of research fellowship.

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Correspondence to Harminder Pal Singh.

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Mahajan, P., Singh, H.P., Batish, D.R. et al. Cr(VI) Imposed Toxicity in Maize Seedlings Assessed in Terms of Disruption in Carbohydrate Metabolism. Biol Trace Elem Res 156, 316–322 (2013). https://doi.org/10.1007/s12011-013-9806-5

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  • DOI: https://doi.org/10.1007/s12011-013-9806-5

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