Dynamics of arbuscular mycorrhizal symbiosis in heavy metal phytoremediation: Meta-analytical and conceptual perspectives

被引：83

作者：

Audet, Patrick ^{[1
]}

Charest, Christiane ^{[1
]}

机构：

[1] Univ Ottawa, Dept Biol, Ottawa Carleton Inst Biol, Ottawa, ON K1N 6N5, Canada

来源：

ENVIRONMENTAL POLLUTION | 2007年 / 147卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

AM feedback; HM bioavailability; HM phytotoxicity; stress-avoidance;

D O I：

10.1016/j.envpol.2006.10.006

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

To estimate dynamics of arbuscular mycorrhizal (AM) symbiosis in heavy metal (HM) phytoremediation, we conducted a literature survey and correlated HM uptake and relative plant growth parameters from published data. After estimating AM feedback responses for these parameters at low and high soil-HM concentration intervals, we determined that the roles of AM symbiosis are characterized by (1) an increased HM phytoextraction via mycorrhizospheric 'Enhanced Uptake' at low soil-HM concentrations, and (2) a reduced HM bioavailability via AM fungal 'Metal-Binding' processes at high soil-HM levels, hence resulting in increased plant biomass and enhanced plant tolerance through HM stress-avoidance. We present two conceptual models which illustrate the important compromise between plant growth, plant HM uptake and HM tolerance, and further emphasize the importance of AM symbiosis in buffering the soil environment for plants under such stress conditions. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：609 / 614

页数：6