Chromium Accumulation and Toxicity in Corn (Zea mays L.) Seedlings
Sadia Naseem1, Muhammad Yasin2, Ambreen Ahmed1, Muhammad Faisal2
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1Department of Botany, University of the Punjab, Quaid-e-Azam Campus, Lahore-54590, Pakistan
2Department of Microbiology and Molecular Genetics, University of the Punjab
Quaid-e-Azam Campus, Lahore-54590, Pakistan
Pol. J. Environ. Stud. 2015;24(2):899–904
Extensive use of chromate compounds in the last few decades has resulted in contamination of our environment. In the present study we have investigated the effects of two different concentrations (10, 20 μg ml-1) of chromium salts (CrCl3, K2CrO4, K2Cr2O7) on the growth of Zea mays L. As concentrations of chromium salts (CrCl3, K2CrO4, K2Cr2O7) increased, there was a significant decrease in seed germination (10-24%), shoot length (6-29%), root length (11-33%), seedling length (16-24%), fresh weight of seedlings (17-67%) and increase in dry weight per seedling (3-15%), chromium content, acid phosphatases content (215-707%), and peroxidases activity (129-200%) of Zea mays plants compared to control treatment. In all treatments, the effect of hexavalent salts (K2CrO4 and K2Cr2O7) was more severe on plant growth compared to trivalent Cr salts (CrCl3). Zea mays plants have the ability to accumulate various chromium salts in their tissues and thus help to remediate the polluted soil.