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| Effects of calcium polypeptides on adsorption of the heavy metal lead in rice |
| Received:January 08, 2021 |
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| KeyWord:calcium polypeptides;lead contamination;rice;in situ immobilization remediation |
| Author Name | Affiliation | E-mail | | YANG Sheng | State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China | | | MAO Wenling | State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China | | | WU Honghong | State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China | | | LIU Ziwei | State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China | | | YAO Lunguang | Collaborative Innovation Center of Water Security for Water Source Region of Mid-route Project of South-North Water Diversion of Henan Province, School of Agricultural Engineering, Nanyang Normal University, Nanyang 473061, China | | | TANG Xingchun | State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China | | | LI Yadong | State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China | lyd55555@sina.com |
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| Abstract: |
| The study compared the effects of calcium polypeptides and conventional compound fertilizer on rice grown in soil containing different concentrations of lead（100, 200 mg·kg-1, and 500 mg·kg-1）. These effects included those associated with the available lead content, pH of soil, and growth of rice. In addition, calcium and lead levels were monitored in selected rice tissues during the different stages of growth. The results revealed that compared with the conventional compound fertilizer, the utilization of calcium polypeptides could reduce the available lead content and increase the pH value of lead-contaminated soil. Moreover, applying calcium polypeptides resulted in the enhancements of plant height（6.8%~28.9%）and 1 000-grain weight（6.5%~16.9%）. Furthermore, the application of calcium polypeptides contributed to an increase in the lead content of rice roots（10.8%~120.6%）, but reductions in the stems（2.2%~28.4%）, leaves（0.5%~28.6%）, and brown rice（13.3%~25.5%）. We also detected increases in the calcium contents of different rice tissues, namely, 1.7%~32.6% in roots, 1.6%~17.5% in stems, 1.1%~13.4% in leaves, and 12.4%~21.5% in brown rice. These results indicate that there is a negative correlation between the contents of calcium and lead in the stems, leaves, and brown rice of rice. However, it was found that the positive effects of calcium polypeptides decreased gradually over time. |
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