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Citation
Tags
HERO ID
5126518
Reference Type
Journal Article
Subtype
Review
Title
Physiological and molecular mechanisms of heavy metal accumulation in nonmycorrhizal versus mycorrhizal plants
Author(s)
Shi, W; Zhang, Y; Chen, S; Polle, A; Rennenberg, H; Luo, ZB
Year
2019
Is Peer Reviewed?
1
Journal
Plant, Cell and Environment
ISSN:
0140-7791
EISSN:
1365-3040
Volume
42
Issue
4
Page Numbers
1087-1103
Language
English
PMID
30375657
DOI
10.1111/pce.13471
Web of Science Id
WOS:000462360300001
Abstract
Uptake, translocation, detoxification, and sequestration of heavy metals (HMs) are key processes in plants to deal with excess amounts of HM. Under natural conditions, plant roots often establish ecto- and/or arbuscular-mycorrhizae with their fungal partners, thereby altering HM accumulation in host plants. This review considers the progress in understanding the physiological and molecular mechanisms involved in HM accumulation in nonmycorrhizal versus mycorrhizal plants. In nonmycorrhizal plants, HM ions in the cells can be detoxified with the aid of several chelators. Furthermore, HMs can be sequestered in cell walls, vacuoles, and the Golgi apparatus of plants. The uptake and translocation of HMs are mediated by members of ZIPs, NRAMPs, and HMAs, and HM detoxification and sequestration are mainly modulated by members of ABCs and MTPs in nonmycorrhizal plants. Mycorrhizal-induced changes in HM accumulation in plants are mainly due to HM sequestration by fungal partners and improvements in the nutritional and antioxidative status of host plants. Furthermore, mycorrhizal fungi can trigger the differential expression of genes involved in HM accumulation in both partners. Understanding the molecular mechanisms that underlie HM accumulation in mycorrhizal plants is crucial for the utilization of fungi and their host plants to remediate HM-contaminated soils.
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