Sulfur and carbon research in rice production systems

Blair, Graeme J.; Lefroy, R. D. B.

doi:10.1016/s0378-4290(97)00127-5

Cited by 8 publications

(6 citation statements)

References 17 publications

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“…Sulphur can be a limiting nutrient in rice paddies requiring rice growers to use sulphate amendments (Blair & Lefroy, ) that can potentially increase Hg methylation (Gilmour, Henry, & Mitchell, ). Under these conditions, our data suggest that Hg II reduction and subsequent evasion could potentially be hampered.…”

Section: Resultsmentioning

confidence: 99%

“…This is an important knowledge gap to address because anaerobic Hg II reducers and Hg methylators occupy the same niche in the environment (Desrochers, Paulson, Ptacek, Blowes, & Gould, 2015) and likely compete for a common pool of Hg substrates and nutrients supporting anaerobic metabolisms. For instance, in rice paddies, sulphur can become a limiting nutrient and sulphate amendments are employed to maintain agricultural productivity (Blair & Lefroy, 1998). Such amendments would supply sulphate-reducing bacteria (SRB) that often dominate Hg methylation communities (Ma, Du, Wang, & Sun, 2017;Su, Chang, Hsi, & Lin, 2016;Vishnivetskaya et al, 2018) with ample substrates for anaerobic respiration, which can subsequently increase MeHg production (Jeremiason et al, 2006;Yu, Reinfelder, Hines, & Barkay, 2018).…”

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confidence: 99%

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Reduced sulphur sources favour Hg^II reduction during anoxygenic photosynthesis by Heliobacteria

et al. 2019

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The consumption of rice has become a global food safety issue because rice paddies support the production of high levels of the potent neurotoxin, methylmercury. The production of methylmercury is carried out by chemotrophic anaerobes that rely on a diversity of terminal electron acceptors, namely sulphate. Sulphur can be a limiting nutrient in rice paddies, and sulphate amendments are often used to stimulate crop production, which can increase methylmercury production. Mercury (Hg) redox cycling can affect Hg methylation by controlling the delivery of inorganic Hg substrates to methylators in anoxic habitats. Whereas sulphur is recognized as a key substrate controlling methylmercury production, the controls sulphur exerts on other microbe‐mediated Hg transformations remain poorly understood. To explore the potential coupling between sulphur assimilation and anaerobic HgII reduction to Hg0, we studied Heliobacillus mobilis, a mesophilic anoxygenic phototroph representative from the Heliobacteriacea family originally isolated from a rice paddy. Here, we tested whether the redox state of the sulphur sources available to H. mobilis would affect its ability to reduce HgII. By comparing Hg0 production over a redox gradient of sulphur sources, we demonstrate that phototrophic HgII reduction is favoured in the presence of reduced sulphur sources such as thiosulphate and cysteine. We also show that cysteine exerts dynamic control on Hg cycling by affecting not only Hg's bioavailability but also its abiotic photoreduction under low light conditions. Specifically, in the absence of cells we show that organic matter (as yeast extract) and cysteine are both required for photoreduction to occur. This study offers insights into how one of the most primitive forms of photosynthesis affects Hg redox transformations and frames Heliobacteria as key players in Hg cycling within paddy soils, forming a basis for management strategies to mitigate Hg accumulation in rice.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Reduced sulphur sources favour Hg^II reduction during anoxygenic photosynthesis by Heliobacteria

et al. 2019

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“…The marked increase in crop yield results in increased nutrient removal from the soil; hence, it is predicted that sulfur deficiency will increase (Blair and Lefroy 1998;Hawkesford 2000). The use of fertilizers that do not contain sulfur and the decreasing deposition of sulfur from the atmosphere are also contributing to the incidence of sulfur deficiency.…”

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confidence: 99%

Effects of sulfur nutrition on the growth and photosynthesis of rice

Resurreccion

Makino

Bennett

et al. 2001

Soil Science and Plant Nutrition

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“…Data from the International Rice Research Institute long-term experiment showed a significant increase in organic C content due to N fertilizer (Blair and Lefroy, 1998). Sharma et al (2000) also reported an increase in organic C with N application due to a higher root biomass with a higher rate of N application.…”

Section: Organic Cmentioning

confidence: 99%

Effect of wheat, legume and legume enriched wheat residue and nitrogen application on soil fertility under rice-wheat cropping system

Sharma¹

2004

Archives of Agronomy and Soil Science

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The field experiments were conducted for two crop years of 1997 -98 and 1998 -99 at the Indian Agricultural Research Institute, New Delhi to study the effect of wheat, legume and legume enriched wheat residue (WR) on soil fertility under the rice-wheat cropping system. A rice-wheat cropping system without incorporation of residue depleted organic C over initial level by 0.061%, kjeldahl-N by 0.012%, available P by 0.7 kg ha 7 1 and available K by 36 kg ha 7 1 , whereas incorporation of Sesbania green manure (SGM), mungbean residue (MBR), SGM + WR and MBR + WR increased organic C over the initial level by 0.071, 0.100, 0.163 and 0.133%, respectively, kjeldahl-N by 0.001, 0.004, 0.001 and 0.005% respectively, available P by 2.7, 5.0, 8.5 and 3.2 kg ha 7 1 , respectively and available K by 35, 5, 92 and 12 kg ha 7 1 , respectively in 2 years. As compared with no residue control, incorporation of WR increased organic C by 0.036 -0.102%, kjeldahl-N by 0.002 -0.007% and available K by 23 -45 kg ha 71 , whereas incorporation of SGM and MBR increased organic C by 0.082 -0.132 and 0.103 -0.161%, respectively, kjeldahl-N by 0.009 -0.023 and 0.005 -0.013%, respectively and available K by 5 -71 and 4 -45 kg ha 7 1 , respectively. Incorporation of WR with SGM and MBR was more effective and increased organic C by 0.121 -0.224 and 0.125 -0.194%, respectively, kjeldahl-N by 0.005 -0.029 and 0.010 -0.021%, respectively and available K content by 23 -128 and 11 -116 kg ha 71 . Nitrogen application to rice also increased organic C, kjeldahl-N, available P and available K content in soil and also increased effects of crop residues. Crop residues had no significant effect on available P content in soil. Incorporation of WR with SGM and MBR with adequate fertilizer-N is, thus, recommended for building up organic C, kjeldahl-N and available K content in soil.

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Sulfur and carbon research in rice production systems

Cited by 8 publications

References 17 publications

Reduced sulphur sources favour Hg^II reduction during anoxygenic photosynthesis by Heliobacteria

Reduced sulphur sources favour Hg^II reduction during anoxygenic photosynthesis by Heliobacteria

Effects of sulfur nutrition on the growth and photosynthesis of rice

Effect of wheat, legume and legume enriched wheat residue and nitrogen application on soil fertility under rice-wheat cropping system

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Sulfur and carbon research in rice production systems

Cited by 8 publications

References 17 publications

Reduced sulphur sources favour HgII reduction during anoxygenic photosynthesis by Heliobacteria

Reduced sulphur sources favour HgII reduction during anoxygenic photosynthesis by Heliobacteria

Effects of sulfur nutrition on the growth and photosynthesis of rice

Effect of wheat, legume and legume enriched wheat residue and nitrogen application on soil fertility under rice-wheat cropping system

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Reduced sulphur sources favour Hg^II reduction during anoxygenic photosynthesis by Heliobacteria

Reduced sulphur sources favour Hg^II reduction during anoxygenic photosynthesis by Heliobacteria