Electron transfer capacity of soil dissolved organic matter and its potential impact on soil respiration

Bi, Ran; Lu, Qin; Yu, Weimin; Yuan, Yong; Zhou, Shungui

doi:10.1007/s11368-013-0748-5

Cited by 20 publications

(11 citation statements)

References 36 publications

(53 reference statements)

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“…A common response of bacteria to electron-acceptor limitation is to produce electrically conductive pilus-like appendages called bacterial nanowires (Reguera et al, 2005;Gorby et al, 2006), which anchor between the periplasmic and outer membranes and allow transfer of electrons from the cell to minerals containing Fe 3+ and Mn 4+ in the extracellular environment (Reguera et al, 2005;Gorby et al, 2006; Figure 5). Other demonstrated mechanisms to overcome inhibition include (1) electron shuttling between the cell and extracellular minerals via humic substances in solution (Lovley et al, 1996;Bi et al, 2013;Piepenbrock et al, 2014) and solid state (Roden et al, 2010) or (2) excretion of reduced metabolites by microorganisms, including quinones (Newman and Kolter, 2000) and phenolic compounds (Vempati et al, 1995;Pentrakova et al, 2013), that transfer electrons to the extracellular environment ( Figure 5). Processes outlined above demonstrate that electron transport chain inhibition does not stop intracellular microbial metabolism in soil.…”

Section: Adaptation Mechanisms To Respiration Inhibitionmentioning

confidence: 99%

Soil microorganisms can overcome respiration inhibition by coupling intra- and extracellular metabolism: 13C metabolic tracing reveals the mechanisms

et al. 2017

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CO 2 release from soil is commonly used to estimate toxicity of various substances on microorganisms. However, the mechanisms underlying persistent CO 2 release from soil exposed to toxicants inhibiting microbial respiration, for example, sodium azide (NaN 3 ) or heavy metals (Cd, Hg, Cu), remain unclear. To unravel these mechanisms, NaN 3 -amended soil was incubated with positionspecifically 13 C-labeled glucose and 13 C was quantified in CO 2 , bulk soil, microbial biomass and phospholipid fatty acids (PLFAs). High 13 C recovery from C-1 in CO 2 indicates that glucose was predominantly metabolized via the pentose phosphate pathway irrespective of inhibition. Although NaN 3 prevented 13 C incorporation into PLFA and decreased total CO 2 release, 13 C in CO 2 increased by 12% compared with control soils due to an increased use of glucose for energy production. The allocation of glucose-derived carbon towards extracellular compounds, demonstrated by a fivefold higher 13 C recovery in bulk soil than in microbial biomass, suggests the synthesis of redox active substances for extracellular disposal of electrons to bypass inhibited electron transport chains within the cells. PLFA content doubled within 10 days of inhibition, demonstrating recovery of the microbial community. This growth was largely based on recycling of cost-intensive biomass compounds, for example, alkyl chains, from microbial necromass. The bypass of intracellular toxicity by extracellular electron transport permits the fast recovery of the microbial community. Such efficient strategies to overcome exposure to respiration-inhibiting toxicants may be exclusive to habitats containing redoxsensitive substances. Therefore, the toxic effects of respiration inhibitors on microorganisms are much less intensive in soils than in pure cultures.

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Section: Adaptation Mechanisms To Respiration Inhibitionmentioning

confidence: 99%

Soil microorganisms can overcome respiration inhibition by coupling intra- and extracellular metabolism: 13C metabolic tracing reveals the mechanisms

et al. 2017

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“…Interestingly, the availability of organic matter amendment was still the limiting factor for denitrification in the intensively managed (i.e., intensive input of organic fertilizer) soils even though organic matter was therein. This is likely due to the fact that labile C pools of organic matter can be rapidly mineralized when conditions facilitate (moist conditions and higher soil temperature, as in this intensively managed production system), and the organic matter becomes more recalcitrant over time, limiting the size of the electron donor pool (Bi et al., 2013; Hu et al., 2016; Sánchez‐García et al., 2016; Wright & Snyder, 2009).…”

Section: Discussionmentioning

confidence: 99%

Regulation of the product stoichiometry of denitrification in intensively managed soils

Wei

Yan

YanChao

et al. 2020

Food and Energy Security

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“…DOC is readily degradable and is the major energy source for microorganisms (Haynes, 2005;Hu et al, 1997). Bi et al (2013) reported that soil CO 2 emissions may be aggravated by the electroactive moieties in soil DOC; these moieties function as electron shuttles and facilitate electron transfer reactions in soil respiration and SOC mineralization. Thus, some researchers reported that DOC is significantly related to soil respiration (Bi et al, 2013;Wang et al, 2013), which is also reported by our study (Figure 4).…”

Section: Discussionmentioning

confidence: 99%

“…Bi et al (2013) reported that soil CO 2 emissions may be aggravated by the electroactive moieties in soil DOC; these moieties function as electron shuttles and facilitate electron transfer reactions in soil respiration and SOC mineralization. Thus, some researchers reported that DOC is significantly related to soil respiration (Bi et al, 2013;Wang et al, 2013), which is also reported by our study (Figure 4). In the present study, the higher root and aboveground biomasses in the RNT treatment than those in the FNT treatment (Table 3) may demonstrate a higher DOC content, which was derived from the root exudates and photosynthates translocated from the aboveground biomass; this phenomenon partially explains the higher soil CO 2 flux in the RNT treatment than those in the FNT treatment (Figure 2; Tables 1 and 2).…”

Section: Discussionmentioning

confidence: 99%

Effects of different no-tillage modes on soil CO2 fluxes from paddy fields in central China

Guo

Zhang

et al. 2015

J. Soil Sci. Plant Nutr.

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Differences in soil CO 2 emissions between no-tillage (NT) and conventional intensive tillage have been well assessed in paddy fields, but few studies evaluate the effects of different NT modes on soil CO 2 emissions. Therefore, a field experiment was conducted to assess paddy soil CO 2 flux as affected by different NT modes [ridge cultivation with NT (RNT) and conventional flat cultivation with NT (FNT)] and its influencing factors during the 2012-2014 rice growing seasons in central China. Soil CO 2 fluxes were determined by a LI-8100A soil CO 2 flux system. The mean soil CO 2 fluxes on the ridges in the RNT treatment increased by 49%, 52% and 35% compared with those on the flat land in the FNT treatment in 2012, 2013 and 2014, respectively. Cumulative CO 2 emissions ranged from 1042 g m -2 to 1489 g m -2 from the RNT treatment, and from 724 g m -2 to 1016 g m -2 for the FNT treatment. Moreover, soil CO 2 its emissions were significantly correlated with dissolved organic C, aboveground biomass and root biomass. Therefore, our results suggesting that annual rice-fallowoilseed rape rotation should be considered to assess the effects of tillage systems on soil CO 2 emission.

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Electron transfer capacity of soil dissolved organic matter and its potential impact on soil respiration

Cited by 20 publications

References 36 publications

Soil microorganisms can overcome respiration inhibition by coupling intra- and extracellular metabolism: 13C metabolic tracing reveals the mechanisms

Soil microorganisms can overcome respiration inhibition by coupling intra- and extracellular metabolism: 13C metabolic tracing reveals the mechanisms

Regulation of the product stoichiometry of denitrification in intensively managed soils

Effects of different no-tillage modes on soil CO2 fluxes from paddy fields in central China

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