Abstract
Petroleum hydrocarbon contamination of soil is an emerging environmental threat on the Earth due to possible toxic impact on different ecological receptors. The present study was mainly carried out to evaluate the phytotoxicity of long-term total petroleum hydrocarbon-contaminated soils by the toxicity end points obtained from three plant species Zea mays, Lactuca sativa L., and Cucumis sativus. The tested soil exerted phytotoxicity for all the evaluated end points of plants with dose-dependent relationship. The determined IC50 indicates inhibition in root elongation as the most sensitive toxicity end point for L. sativa L., while inhibition in cross-section area of meristematic zone as the most susceptible and inhibition in seed germination as the least susceptible end points for both Z. mays and C. sativus. The tested root morphometric parameters confirm their applicability as novel toxicity end points. In addition, microcalorimetric analysis confirmed the applicability of inhibition in metabolic heat emission rate as a toxicity end point. Microcalorimetry can be applied to determine the exerted phytotoxic effect on seedlings. The present combined approach concludes that the phytotoxicity of the tested soil is species-specific and varies as follows: Z. mays < C. sativus < L. sativa L. The findings of this study may have implications in planning comprehensive phytotoxicity assessment for hydrocarbon-contaminated soils or screening plant species for phytoremediation program.
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Acknowledgments
This work is supported in part by grants from the National Outstanding Youth Research Foundation of China (40925010), International Joint Key Project from the National Natural Science Foundation of China (40920134003), International Joint Key Project from the Chinese Ministry of Science and Technology (2010DFA12780 and 2009DFA92830), and the National Natural Science Foundation of China (41273092). KM acknowledges the receipt of a Chinese Government Scholarship from the Chinese Scholarship Council.
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Masakorala, K., Yao, J., Guo, H. et al. Phytotoxicity of Long-Term Total Petroleum Hydrocarbon-Contaminated Soil—A Comparative and Combined Approach. Water Air Soil Pollut 224, 1553 (2013). https://doi.org/10.1007/s11270-013-1553-x
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DOI: https://doi.org/10.1007/s11270-013-1553-x