Mechanisms of Enhanced Heavy Metal Tolerance in Plants by Silicon: A Review  

作　　者：WU Jia-Wen SHI Yu ZHU Yong-Xing WANG Yi-Chao GONG Hai-Jun 

机构地区：[1]State Key Laboratory of Crop Stress Biology in Arid Areas,College of Horticulture,Northwest A&F University

出　　处：《Pedosphere》2013年第6期815-825,共11页土壤圈（英文版）

基　　金：Supported by the Program for New Century Excellent Talents in University of China(No.NCET-11-0441);the Chinese Universities Scientific Fund(No.QN2011092);the Talent Introduction Startup Fund of Northwest A&F University,China(No.Z111021003)

摘　　要：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.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.

关 键 词：ANTIOXIDANT CADMIUM COMPARTMENTATION detoxifieation MANGANESE 

分 类 号：Q945[生物学—植物学]