Cadmium uptake and subcellular distribution in plants of Lactuca sp. Cd–Mn interaction

Ramos, I.; Esteban, Elvira; Lucena, Juan J.; Gárate, A.

doi:10.1016/s0168-9452(02)00017-1

Cited by 248 publications

(143 citation statements)

References 30 publications

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“…25 It interferes with photosynthesis, respiration and water relations 18,19,24,76 and the process of uptake and translocation of mineral nutrients lead to significant alterations in the normal plant growth. 19,77,78 The causes of these dysfunctions include irreversible changes to protein conformation by forming metalthiolate bonds and alteration of the cell wall and membrane permeability by binding to nucleophilic groups 79 through the production of ROS. 39 The effect of Cd on N and S assimilation pathway has been studied in several plants showing an inhibition of the nitrate uptake rate and the activity of the enzymes involved in the nitrate assimilation pathway.…”

Section: Cadmium Stress and Sulfur Metabolismmentioning

confidence: 99%

Cadmium stress tolerance in crop plants

Gill

Tuteja

2011

Plant Signaling & Behavior

344

137

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Section: Cadmium Stress and Sulfur Metabolismmentioning

confidence: 99%

Cadmium stress tolerance in crop plants

Gill

Tuteja

2011

Plant Signaling & Behavior

344

137

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“…Plants with exclusion strategy can avoid excessive metal ion uptake and restrict its transport from roots to shoots. Some tolerant plants can hold heavy metals ions in the cell walls (Ramos et al 2002;Zornoza et al 2002;Lou et al 2004;Wójcik et al 2005) by reducing the formation of heavy metal complex with large mass molecules in plant cell plasma. In an investigation into the role of Ni-chelating excudates in Ni hyperaccumulating plants it was observed that the Ni-chelating histidine and citrate accumulated in the root excudates of non-hyperaccumulating plants and…”

Section: Tolerance and Detoxification Of Metal Ionsmentioning

confidence: 99%

Biochemical changes and adaptive strategies of plants under heavy metal stress

2011

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Heavy metal contamination of soil, aqueous waste stream and ground water causes major environmental and human health problems. Heavy metals are major environmental pollutants when they are present in high concentration in soil and show potential toxic effects on growth and development in plants. Due to unabated, indiscriminate and uncontrolled discharge of hazardous chemicals including heavy metals into the environment, plant continuously have to face various environmental constraints. In plants, seed germination is the first exchange interface with the surrounding medium and has been considered as highly sensitive to environmental changes. One of the crucial events during seed germination entails mobilization of seed reserves which is indispensable for the growth of embryonic axis. But, metabolic alterations by heavy metal exposure are known to depress the mobilization and utilization of reserve food by affecting the activity of hydrolytic enzymes. Some plants possess a range of potential mechanisms that may be involved in the detoxification of heavy metals by which they manage to survive under metal stress. High tolerance to heavy metal toxicity could rely either on reduced uptake or increase planned internal sequestration which is manifested by an interaction between a genotype and its environment. Such mechanism involves the binding of heavy metals to cell wall, immobilization, exclusion of the plasma membrane, efflux of these toxic metal ions, reduction of heavy metal transport, compartmentalization and metal chelation by tonoplast located transporters and expression of more general stress response mechanisms such as stress proteins. It is important to understand the toxicity response of plant to heavy metals so that we can utilize appropriate plant species in the rehabilitation of contaminated areas. Therefore, in the present review attempts have been made to evaluate the effects of increasing level of heavy metal in soils on the key behavior of hydrolytic and nitrogen assimilation enzymes. Additionally, it also provides a broad overview of the strategies adopted by plants against heavy metal stress.

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“…The import ance of Cd binding to cell walls and the lim itation of its subsequent translocation to shoots has been demonstrated for root cells of non-hyperaccumulating plants (Wagner 1993, Grant et al 1998) and was recently de scribed for Thlaspi caerulescens hairy roots (Boominathan & Doran 2003). Some authors suggest that in roots, the capacity to bind Cd in the cell wall has a protective action against the deleterious effect of Cd by redu cing the amounts of cytosolic Cd (LozanoRodríguez et al 1997, Ramos et al 2002, Zornoza et al 2002. Again, Wójcik et al (2005) and Vögeli-Lange & Wagner (1990) suggest that the cell wall plays a minor role in Cd retention in leaves, and the main mechanisms of Cd detoxification are located inside cells, in vacuoles.…”

Section: Clonementioning

confidence: 99%