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| FTIR Spectral Characteristics of Rice Plant Growing in Mercury Contaminated Soil |
| HU Hua-ling1, 2, 3, LI Meng2, 3*, HE Xiao-song2, 3, XI Bei-dou2, 3, ZHANG Hui2, 3, LI Dan2, 3, HUANG Cai-hong2, 3, TAN Wen-bing2, 3 |
1. School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
2. Innovation Base of Ground Water & Environmental System Engineering, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
3. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China |
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Abstract Soilmercury (Hg) contamination may affect the growth of rice plant and rice quality. However, little information has been available so far on the effect of Hg pollution on the molecular structure of nutrientcomponents in rice by Fourier transform-infrared spectroscopy(FT-IR). This study aimed to detect the effect of soil Hg pollution on the FT-IRcharacteristics of rice plant organs through a FT-IR scanning of riceroot, stalkplus leaf, and seed collected from rice field under low-, medium-, high-Hg contamination. Results showed that soil Hg resulted in an accumulation in rice organs with an Hg allocation: root >stalk plus leaf>seed. FT-IR signals of root and stalk plus leaf at 3 428, 2 922, 2 851, 2 364, 2 344, 1 750～1 500，1 150～935 cm-1 were under influence of Hg stress. Meanwhile, FT-IR spectra of rice seed seemed to be affected by Hg pollution at 3 426, 2 361, 2 335 and 1 750～1 300 cm-1. FT-IR analysis may indicate that Hg stress reduced absorbance of carbohydrate in all rice organs and stimulated the production of carboxylic acids, galactosum, and saturated lipids in root and the synthesis of polysaccharides in stalk and leaf. Root, stalk and leaf were the main organs to resist Hg stress for rice plant. Root may secrete organic acids to chelate Hg and enhance the formation of cytoderm to adsorb Hg, which may withhold Hg transportation from root surface to rice plant. It is supposed that an appropriate utilization of such mechanism of Hg resistance may reduce the harm to rice plant. Attention should be paid not only on the content accumulation of Hg in rice but also the effect of Hg contamination on rice growth and rice quality.
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Received: 2017-07-27
Accepted: 2017-12-08
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Corresponding Authors:
LI Meng
E-mail: limeng01@craes.org.cn
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