The significance of the cadmium species in uptake and metabolism of cadmium in crop plants

Girling, C.A.; Peterson, P. J.

doi:10.1080/01904168109362873

Cited by 34 publications

(11 citation statements)

References 27 publications

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“…The mode of interaction was dependent on the relative concentration of elements in nutrient solution and did not exhibit any definite trends. Girling and Peterson [34] noticed that at equimolar concentrations of Zn and Cd in a nutrient solution Zn stimulated uptake of Cd by corn but when Zn : Cd ratio in solution was increased, the antagonistic effect of Zn on Cd uptake became evident. Honma and Hirata [23] and Green et al [36] observed similar effects in hydroponically grown rice plants and concluded that the synergistic or antagonistic effect between Zn and Cd depended on the Cd : Zn ratio and the absolute level of Cd in nutrient solution.…”

Section: Zinc-cadmium Interactionmentioning

confidence: 99%

“…[31][32][33] Increased supply of Zn in soil and hydroponic cultures has been reported to decrease Cd uptake by a variety of plant species including rice. [34] The effect is especially pronounced when Zn is raised from a deficiency to sufficiency level (rice, [23] lettuce [32] ). Other studies demonstrated that the nature of the interaction between these two elements is more complex.…”

Section: Zinc-cadmium Interactionmentioning

confidence: 99%

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Growing Rice Grain With Controlled Cadmium Concentrations

Kukier¹,

Chaney²

2002

Journal of Plant Nutrition

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Two solution studies were conducted a) to investigate the uptake of zinc (Zn) and cadmium (Cd) by rice plants (Oryza sativa L.) and interaction between these elements, and b) to determine experimental conditions for growing rice grain with desired Cd concentration for an animal feeding study. In both studies, free metal activities of cadmium and cationic microelements were buffered by an excess of chelating agents. The first study was a factorial design with two Zn levels (1.0 and 3.89 mM) and four Cd levels (0.81, 1.44, 2.56 and 4.55 mM) in the solution. In the second study, rice was grown in two solutions of different microand macro-element compositions and three Cd levels (0.0, 0.5, and 2.0 mM). In the first study, solution Zn concentration of 3.89 mM and corresponding free metal activity (pZn 2þ ) of 6.00 was toxic to young rice plants. With time, Zn concentrations in rice plants decreased while Cd concentrations increased. Toxic concentration of Cd in roots (about 100 mg kg À1 ) associated with

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Section: Zinc-cadmium Interactionmentioning

confidence: 99%

Section: Zinc-cadmium Interactionmentioning

confidence: 99%

Growing Rice Grain With Controlled Cadmium Concentrations

Kukier¹,

Chaney²

2002

Journal of Plant Nutrition

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“…The latter value is in line with that expected for Cd-induced cyanobacterial MT, based on its metals/ amino acid composition. 5 The metal content in the Zn-rich MT, however, is about threefold higher. If the metals are bound only by the SH group of cysteine residues, as found in mammalian MTs, the ratio should be around 3.14 Olafson et alloa reported that the MT in a cyanobacterium (Synechococcus strain Tx-20) has two tyrosines, two histidines, two glutamic acids and two aspartic acids per molecule.…”

Section: Mt Induction By Individual Metal Ionsmentioning

confidence: 99%

Individual and Synergistic Effects of Heavy-Metal Ions on the Induction of Cyanobacterial Metallothionein Examined by High-Performance Liquid Chromatography/Inductively Coupled Plasma Mass Spectrometry

Takatera

Watanabe

1993

ANAL. SCI.

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The effects of Cue, Zn2+ and Cd2+ ions on the induction of metallothionein (MT) in a cyanobacterium Anacystis nidulans R-2 have been studied by high-performance liquid chromatography (HPLC) with inductively coupled plasma mass spectrometric (ICP/ MS) detection. After growing the cells in media of systematically varied metal concentrations, the contents of each metal in induced MT were determined by HPLC-ICP/ MS. By separate dosing of a metal ion, MT induction was clearly observed with Zn2+ and Cd2+, but not with Cuet However, Cu2+ induced MT in the presence of a high level (0.77 µM) of Zn2t A high level of Zn2+ also significantly promoted MT induction by Cd2+. These synergistic effects have revealed the predominant role of Zn2+ in heavy-metal detoxification by the organism. The partition of Cu, Zn and Cd between the cytoplasm and the cell wall was studied for cells grown in a medium fairly enriched in the three heavy-metal ions. KeywordsInductively coupled plasma mass spectrometry, high-performance liquid chromatography, metallothionein, cyanobacterium, sulfhydril group, heavy metal Metallothioneins (MTs) are low-molecular weight proteins which are heat-stable and rich in cysteine residues with high affinity for copper, zinc and cadmium ions. ' MTs are apparently involved in the transport of metals2, metal homeostasis3 and metal detoxification processes4, though the principal biological role of MTs still remains to be clarified.MTs are typically induced in living organisms under the stress of heavy-metal ions.' So far, although a number of studies have been published regarding the effect of an individual toxic metal ion on the MT induction, studies concerning possible synergistic effects of different metal ions have been rather scarce.For higher plants, Girling and Peterson5 reported that Zn uptake increases the Cd content in the organism, though at a high Zn dose an inhibitory effect concerning Cd uptake appears.Turner6 observed for several crops that the Zn content in the plant increases upon adding Cd2+ at a concentration below 0.1 g m3, while the total Zn uptake decreases after the Cd2+ concentration exceeds 1 g m3. Wallace' noted a protective effect of Cu2+ on beans under a high dose of Cd2tAll of these studies concern the interactive effects of metal ions from the viewpoint of the total metal uptake in plants; only little attention has been paid to the conversion of their chemical form, particularly MT induction.As an extension of our attempts8'9 to implement highperformance liquid chromatography (HPLC) combined with inductively coupled plasma mass spectrometry (ICP/ MS) for environmental studies, we investigated both individual and synergic effects of Cu2+, Zn2+ and Cd2+ on MT induction in a cyanobacterium, Anacystis nidulans R-2. ICP/ MS features a highly sensitive, metal-specific analysis of metalloproteins without any need for radioactive tracers. The choice of a cyanobacterium is due to its primary importance as an origin of trophic chains in an aquatic system, its rapid growth and ease in controlli...

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“…The Cd concentration was chosen to represent heavily polluted conditions. The zinc concentration was based on published data on the interactions of Zn and Cd which showed that a molar ratio of Zn/Cd of 1:1 was a threshold value above which an antagonistic effect of Zn and Cd might occur (Girling and Peterson 1981;Green et al 2001). The P concentration was based on Liu et al (2004b).…”

Section: Experimental Treatmentsmentioning

confidence: 99%