Pedosphere 23(6): 815--825, 2013
ISSN 1002-0160/CN 32-1315/P
©2013 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Mechanisms of enhanced heavy metal tolerance in plants by silicon: A review |
WU Jia-Wen, SHI Yu, ZHU Yong-Xing, WANG Yi-Chao and GONG Hai-Jun |
| State Key Laboratory of Crop Stress Biology in Arid Areas, College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712101 (China) |
| ABSTRACT |
| In recent years, due to excessive emission of industrial waste, wastewater irrigation, and unreasonable utilization of fertilizers, pesticides and plastic sheeting, heavy metal pollution is increasing rapidly, resulting in many environmental problems. Silicon (Si), as the second most abundant element in the soil, can not only stimulate plant growth, but alleviate various biotic and abiotic stresses, including heavy metal stress. Here, we reviewed recent advances in the mechanisms for Si-mediated heavy metal tolerance in plants. These mechanisms included reducing active heavy metal ions in growth media, reducing heavy metal transport to the shoot, stimulating enzymatic and non-enzymatic antioxidants, chelation, compartmentation, regulation of the expression of metal transport genes, and structural changes in plants. Further research orientation is also discussed. |
| Key Words: antioxidant, cadmium, compartmentation, detoxification, manganese |
| Citation: Wu, J. W., Shi, Y., Zhu, Y. X., Wang, Y. C. and Gong, H. J. 2013. Mechanisms of enhanced heavy metal tolerance in plants by silicon: A review. Pedosphere. 23(6): 815-825. |
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