The Bioaccumulation and Migration of Inorganic Mercury and Methylmercury in the Rice Plants

Zhu, Daiwen; Han, Jichang; Wu, Shizhang

doi:10.15244/pjoes/68964

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…Of course, the combining of mercury and OM is subject to many other factors, such as the degradation and mineralization of OM (Gray & Hines, ), the concentration and presence of inorganic mercury, and the type and activity of the SRB (Macalady, Mack, Nelson, & Scow, ) and sulfate ion concentration (Branfireun, Roulet, Kelly, & Rudd, ). These findings are in agreement with previous studies (Gu et al., ; Zhu, Han, & Wu, ), indicating that OM and pH had a high impact on MeHg production. The concentration of MeHg in soil samples is the net result of a dynamic equilibrium between Hg methylation, MeHg demethylation, and the reduction of Hg 2+ to Hg (Bravo et al., ).…”

Section: Resultssupporting

confidence: 93%

Diversity of microbial communities potentially involved in mercury methylation in rice paddies surrounding typical mercury mining areas in China

Liu

Zhuang

et al. 2018

MicrobiologyOpen

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Mercury can be a serious hazard to human health, especially in paddy soils surrounding mining areas. In this study, mercury (Hg)‐methylating microbes with the potential biomarker gene hgcA were obtained from 45 paddy soil samples in mercury mining areas in Fenghuang, Wanshan, and Xunyang. In different areas, the abundance of the hgcA gene was affected by different environmental factors, including organic matter, pH, total carbon content, total nitrogen content, and total mercury content. Phylogenetic analysis showed that hgcA microbes in paddy soils were potentially members of the phyla Proteobacteria, Euryarchaeota, Chloroflexi, and two unnamed groups. Canonical correspondence analysis showed that pH and organic matter impacted the hgcA gene diversity and the microbial community structures in paddy soils. The identification of Hg‐methylating microbes may be crucial for understanding mercury methylation/demethylation processes, which would be helpful in assessing the risk of methylmercury contamination in the food chain.

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Section: Resultssupporting

confidence: 93%

Diversity of microbial communities potentially involved in mercury methylation in rice paddies surrounding typical mercury mining areas in China

Liu

Zhuang

et al. 2018

MicrobiologyOpen

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“…Saline-sodic soil is widely distributed in the western Songnen Plain of northeastern China, and the total area of saline-sodic soil is about 337 × 10 4 hectares. More alarmingly, approximately 20.0 × 10 3 ha of land is newly salinized and/or alkalized every year in this area, posing a serious threat to crop production [11][12][13][14]. Sodium carbonate and sodium bicarbonate (Na 2 CO 3 and NaHCO 3 ) are two main salts in saline-sodic soil, with soil pH mostly reaching 8.5 or more, and soil physical properties are very poor [15].…”

Section: Introductionmentioning

confidence: 99%

How Different Nitrogen Application Rates Affect Yield Composition and Nitrogen Uptake of Rice (Oryza sativa L.) in a Saline-Sodic Paddy Field

Bao¹,

Huang²,

Li³

et al. 2018

Pol. J. Environ. Stud.

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Planting rice (OryzasativaL.) is an effective and feasible approach for improving salt-affected soils, especially in saline-sodic soils. Improved rice is the main biological measure for rapid treatment and utilization of a saline-sodic paddy field. Reasonable application of nitrogen fertilizer is an important measure for obtaining saline-sodic soil high yield. Dongdao 4 (D-4), Dongdao 2 (D-2), Changbai 9 (C-9), and Baijing 1 (B-1)) were studied by a field experiment in this paper. On the growth, yield, and yield component responses of different nitrogen levels (150 kg N/ha, 225 kg N/ha and 300 kg N/ha), and the nitrogen uptake of four saline-tolerant rice cultivars at different nitrogen application levels was calculated, which provided a useful reference for the rational application of nitrogen fertilizer in a salinesodic paddy field. The results showed that: biomass of four kinds of rice accumulates over time and reached their maximums in September, with the biomasses of D-2 and D-4 reaching the maximum of 225 kg N/ha, and C-9 and B-1 reaching the maximum at 300 kg N/ha, which is related to rice varieties; the yields of four salt-tolerant rice plants reached the highest in 150 kg N/ha; applied nitrogen fertilizer reasonably was beneficial to increase the number of spikes and the number of effective grains per spike, in this experiment, the optimum amount of nitrogen is 150 kg N/ha, and the number of spikes and the number of effective grains per spike also were major factors in increasing production. With 1000-grain weight, primary and secondary branches made no significant contribution to the yield; the N uptake of four kinds of rice gradually increased over time and reached the maximum in September. There was no significant difference in the nitrogen grain production efficiency of 4 rice varieties under different nitrogen application rates; with the increase of nitrogen application rate, partial productivity of nitrogen fertilizer

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The Bioaccumulation and Migration of Inorganic Mercury and Methylmercury in the Rice Plants

Cited by 2 publications

References 18 publications

Diversity of microbial communities potentially involved in mercury methylation in rice paddies surrounding typical mercury mining areas in China

Diversity of microbial communities potentially involved in mercury methylation in rice paddies surrounding typical mercury mining areas in China

How Different Nitrogen Application Rates Affect Yield Composition and Nitrogen Uptake of Rice (Oryza sativa L.) in a Saline-Sodic Paddy Field

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