Metal tolerance in plants: Molecular and physicochemical interface determines the "not so heavy effect" of heavy metals. (January 2022)

• Record Type: Journal Article
• Authors: Thakur, Meenakshi; Praveen, Shamima; Divte, Pandurang R.; Mitra, Raktim; Kumar, Mahesh; Gupta, Chandan Kumar; Kalidindi, Usha; Bansal, Ruchi; Roy, Suman; Anand, Anjali; Singh, Bhupinder
• Is Part Of: Chemosphere. Volume 287:Part 1(2022)
• Publication Date: 2022-01
• Subjects: Glutathione -- Heavy metal stress -- Homeostasis -- Metallothionein -- Organic acids -- Phytochelatins -- Transporters; ABC ATP binding cassette -- AsA ascorbic acid -- COX cytochrome c oxidase -- ATM ABC transporters of the mitochondria -- APX ascorbate peroxidase -- CAT catalase -- CAX calcium exchangers -- CCH copper chaperone -- CDF cation diffusion facilitator -- CNGC cyclic nucleotide gated channel -- COPT copper cation transporter -- DHAP dihydroxyacetone phosphate -- DHAR dehydroascorbate reductase -- DM dry matter -- DMA 2′-deoxymugineic acid -- ECA endoplasmic reticulum Ca-ATPase -- epi-HDMA 3-epihydroxy 2′-deoxymugineic acid -- epi-HMA 3-epihydroxymugineic acid -- ER endoplasmic reticulum -- GlyI glyoxalase I -- GlyII glyoxalase II -- G3P glyceraldehyde-3-phosphate -- GPX glutathione peroxidase -- GSH glutathione -- GR glutathione reductase -- GST glutathione S-transferase -- HGA homogalacturonan -- HMAs heavy metal ATPases -- HMW high molecular weight -- H2O2 hydrogen peroxide -- HSP heat shock protein -- IREG iron regulated transport protein -- IRT iron regulated transporter -- LCT low-affinity cation transporter -- LMW low molecular weight -- MA mugineic acid -- MAPK mitogen activated protein kinase -- MG methylglyoxal -- MRP multidrug resistance-associated proteins -- MT metallothionein -- MTP metal tolerance protein -- NAS nicotianamine synthase -- NAAT nicotianamine aminotransferase -- NRAMPs natural resistance associated macrophage proteins -- OA organic acid -- PC phytochelatin -- PCS phytochelatin synthase -- PDR pleiotropic drug resistance -- PE pectin acetylase -- PME pectin methylesterase -- PS phytosiderophores -- R receptor -- RAN1 responsive to antagonist 1 -- ROOH organic peroxide -- ROS reactive oxygen species -- SLG S-d-lactoylglutathione -- TF transcription factor -- TPI Triose phosphate isomerase -- VIT vacuolar iron transporters -- YSL yellow stripe1-like -- ZIF zinc induced facilitator -- ZIP ZRT and IRT-like protein -- ZRT zinc regulated transporter; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.131957
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: An increase in technological interventions and ruthless urbanization in the name of development has deteriorated our environment over time and caused the buildup of heavy metals (HMs) in the soil and water resources. These heavy metals are gaining increased access into our food chain through the plant and/or animal-based products, to adversely impact human health. The issue of how to restrict the entry of HMs or modulate their response in event of their ingress into the plant system is worrisome. The current knowledge on the interactive-regulatory role and contribution of different physical, biophysical, biochemical, physiological, and molecular factors that determine the heavy metal availability-uptake-partitioning dynamics in the soil-plant-environment needs to be updated. The present review critically analyses the interactive overlaps between different adaptation and tolerance strategies that may be causally related to their cellular localization, conjugation and homeostasis, a relative affinity for the transporters, rhizosphere modifications, activation of efflux pumps and vacuolar sequestration that singly or collectively determine a plant's response to HM stress. Recently postulated role of gaseous pollutants such as SO2 and other secondary metabolites in heavy metal tolerance, which may be regulated at the whole plant and/or tissue/cell is discussed to delineate and work towards a "not so heavy" response of plants to heavy metals present in the contaminated soils. Highlights: Industrialization and excessive fertilizer/pesticides use release HM into atmosphere. Homeostasis of HMs through various mechanisms determines a plant's response to stress. GSH, organic acids, proline, hormones, chelatins, MTs, HSPs protect against HMs. Novel adsorbents and organic compounds mitigate against HM stress.