Ferrous Ions Inhibit Cu Uptake and Accumulation via Inducing Iron Plaque and Regulating Metabolism of Rice Plants Exposed to CuO Nanoparticles

This study investigated the impact of soil type and rice cultivars on variations in the iron plaque formation and cadmium (Cd) accumulation by different portions of rice seedlings under the influence of Fe amendment. The experiments were performed in pots under glasshouse conditions using two typical paddy soils. Rice seedlings were exposed to three concentrations of Cd (0, 1 and 3 mg kg−1 soil) and Fe (0, 1.0 and 2.0 g kg−1 soil). The results revealed that shoot biomass decreased by 12.2–23.2% in Quest and 12.8–30.8% in Langi in the Cd1.0 and Cd3.0 treatments, while shoot biomass increased by 11.2–19.5% in Quest and 26–43.3% in Langi in Fe1.0 and Fe2.0 as compared to the Fe control. The Cd concentration in the roots and shoots of rice seedlings were in the order of Langi cultivar > Quest cultivar, but the Fe concentration in rice tissues showed the reverse order. Fe plaque formations were promoted by Fe application, which was 7.8 and 10.4 times higher at 1 and 2 g kg−1 Fe applications compared to the control Fe treatment. The Quest cultivar exhibited 13% higher iron plaque formation capacity compared to the Langi cultivar in both soil types. These results indicate that enhanced iron plaque formation on the root surface was crucial to reduce the Cd concentration in rice plants, which could be an effective strategy to regulate grain Cd accumulation in rice plants.

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Effects of Selenium Application in Soil on Formation of Iron Plaque outside Roots and Cadmium Uptake by Rice Plants

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.750-752.1573 ◽

2013 ◽

Vol 750-752 ◽

pp. 1573-1576 ◽

Cited By ~ 6

Author(s):

Hong Chang ◽

Xin Bin Zhou ◽

Wen Hua Wang ◽

Yong Xiang Zhou ◽

Wen Cai Dai ◽

...

Keyword(s):

Iron Plaque ◽

Toxic Effects ◽

Cadmium Uptake ◽

Selenium Content ◽

Rice Husks ◽

High Concentration ◽

Low Concentration ◽

Rice Plants ◽

Rice Growth ◽

Pot Trial

A pot trial with a soil-sand combination culture in rhizosphere bags was conducted to study the effects of applying Se in soil on formation of iron plaque outside roots, rice growth and absorption of Se and Cd under the control conditions. The results showed that application of low concentration Se (1.0 mg/kg) can promote the formation of iron plaque outside roots, but application of high concentration Se (8.0 mg/kg) can inhibit formation of iron plaque outside roots. Whether applying Cd or not, Se on rice growth had no significant effect, which explained Se on rice growth had not produced toxic effects. With the increasing of Se treatment concentrations, the Cd content of roots, stems, leaves, rice husks and rice significantly decreased. Application of selenium can improve the selenium content in rice, which explained rice had enrichment effect for selenium.

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Rhizosphere iron and manganese-oxidizing bacteria stimulate root iron plaque formation and regulate Cd uptake of rice plants (Oryza sativa L.)

Journal of Environmental Management ◽

10.1016/j.jenvman.2020.111533 ◽

2021 ◽

Vol 278 ◽

pp. 111533

Author(s):

Ting Wei ◽

Xun Liu ◽

MingFang Dong ◽

Xin Lv ◽

Li Hua ◽

...

Keyword(s):

Oryza Sativa ◽

Oryza Sativa L ◽

Plaque Formation ◽

Iron Plaque ◽

Cd Uptake ◽

Rice Plants ◽

Iron And Manganese

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The class III peroxidase gene OsPrx24 is important for root Iron plaque formation and benefits phosphorus uptake in Rice plants under alternate wetting and drying irrigation

Plant and Soil ◽

10.1007/s11104-020-04455-x ◽

2020 ◽

Vol 448 (1-2) ◽

pp. 621-646

Author(s):

Xu-Jian Yang ◽

You-Qiang Fu ◽

Shuo Ma ◽

Haihua Gan ◽

Weifeng Xu ◽

...

Keyword(s):

Phosphorus Uptake ◽

Plaque Formation ◽

Iron Plaque ◽

Class Iii ◽

Wetting And Drying ◽

Alternate Wetting And Drying ◽

Rice Plants ◽

Peroxidase Gene ◽

Class Iii Peroxidase

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Influence of elemental sulfur on cadmium bioavailability, microbial community in paddy soil and Cd accumulation in rice plants

Scientific Reports ◽

10.1038/s41598-021-91003-x ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Lijuan Sun ◽

Ke Song ◽

Lizheng Shi ◽

Dechao Duan ◽

Hong Zhang ◽

...

Keyword(s):

Paddy Soil ◽

Rhizosphere Soil ◽

Iron Plaque ◽

Rice Grain ◽

Cd Accumulation ◽

Rice Plants ◽

Rice Rhizosphere ◽

Residue Decomposition ◽

Living Organisms ◽

Diffusive Gradients

AbstractCadmium (Cd) is highly toxic to living organisms and the contamination of Cd in paddy soil in China has received much attention. In the present study, by conducting pot experiment, the influence of S fertilizer (S0) on rice growth, iron plaque formation, Cd accumulation in rice plants and bacterial community in rice rhizosphere soil was investigated. The biomass of rice plants was significantly increased by S0 addition (19.5–73.6%). The addition of S0 increased the formation of iron plaque by 24.3–45.8%, meanwhile the amount of Cd sequestered on iron plaque increased. In soil treated with 5 mg/kg Cd, addition of 0.2 g/kg S0 decreased the diffusive gradients in thin films (DGT) extractable Cd by 60.0%. The application of S0 significantly decreased the concentration of Cd in rice grain by 12.1% (0.1 g/kg) and 36.6% (0.2 g/kg) respectively. The addition of S0 significantly increased the ratio of Acidobacteria, Bacteroidetes in rice rhizosphere soil. Meanwhile, the ratio of Planctomycetes and Chloroflexi decreased. The results indicated that promoting Fe- and S-reducing and residue decomposition bacterial in the rhizosphere by S0 may be one biological reason for reducing Cd risk in the soil-rice system.

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