System performance and microbial community succession in a partial nitrification biofilm reactor in response to salinity stress

Li, Jibin; Ye, Wei; Wei, Dong; Ngo, Huu Hao; Guo, Wenshan; Qiao, Yue; Xu, Weiying; Du, Bin; Wei, Qin

doi:10.1016/j.biortech.2018.09.068

Cited by 65 publications

(13 citation statements)

References 48 publications

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“…The types of substances secreted determine the strength of these biofilms against salinity stress. High salinity can lead to disruption of biofilms produced through effects on the microbial metabolism and physiological processes ( Bassin et al, 2011 ; Li et al, 2018 ). Curtobacterium albidum strain SRV4 alleviated salinity stress in rice plant due to production of EPS in addition to nitrogen (N 2 ) fixation, IAA production, and ACC deaminase activity ( Vimal et al, 2019 ).…”

Section: Pgpb As a Salinity-alleviating Agentmentioning

confidence: 99%

Plant Growth-Promoting Bacteria: Biological Tools for the Mitigation of Salinity Stress in Plants

et al. 2020

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Salinity stress is one of the major abiotic stresses threatening sustainable crop production worldwide. The extent of salinity affected area is expected to cover about 50% of total agricultural land by 2050. Salinity stress produces various detrimental effects on plants’ physiological, biochemical, and molecular features and reduces productivity. The poor plant growth under salinity stress is due to reduced nutrient mobilization, hormonal imbalance, and formation of reactive oxygen species (ROS), ionic toxicity, and osmotic stress. Additionally, salinity also modulates physicochemical properties and reduces the microbial diversity of soil and thus decreases soil health. On the other hand, the demand for crop production is expected to increase in coming decades owing to the increasing global population. Conventional agricultural practices and improved salt-tolerant crop varieties will not be sufficient to achieve the yields desired in the near future. Plants harbor diverse microbes in their rhizosphere, and these have the potential to cope with the salinity stress. These salinity-tolerant plant growth-promoting bacteria (PGPB) assist the plants in withstanding saline conditions. These plant-associated microbes produce different compounds such as 1-aminocyclopropane-1-carboxylate (ACC) deaminase, indole-3-acetic acid (IAA), antioxidants, extracellular polymeric substance (EPS), and volatile organic compounds (VOC). Additionally, the naturally associated microbiome of plants has the potential to protect the host through stress avoidance, tolerance, and resistance strategies. Recent developments in microbiome research have shown ways in which novel microbe-assisted technologies can enhance plant salt tolerance and enable higher crop production under saline conditions. This focused review article presents the global scenario of salinity stress and discusses research highlights regarding PGPB and the microbiome as a biological tool for mitigation of salinity stress in plants.

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Section: Pgpb As a Salinity-alleviating Agentmentioning

confidence: 99%

Plant Growth-Promoting Bacteria: Biological Tools for the Mitigation of Salinity Stress in Plants

et al. 2020

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“…In addition, nitrite reductase is more sensitive than nitrate reductase to environment changes [57], thus leading to NO 2 − -N accumulation. Table S2 compares the NH 4 + -N removal efficiency by salinity injection [19,34,48,[58][59][60][61][62][63]. [48].…”

Section: Reactor Performancementioning

confidence: 99%

The effects of high salinity on nitrogen removal and the formation characteristics of aerobic granular sludge

Kim

Ahn

2019

Environmental Engineering Research

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This study investigated the biological treatment of high-salinity wastewater using aerobic granular sludge (AGS). The removal performance, AGS characteristics, and microbial community were examined under salinity conditions ranging from 0.5 to 3.0 wt.%. When the salinity was increased, the removal efficiency of the chemical oxygen demand did not change substantially. The mean removal efficiency of NH4+-N ranged from 43.7 to 72.6% during the operation period. As for the concentration of extracellular polymeric substances (EPS), the polysaccharide/protein (PS/PN) ratio increased from 0.37 to 0.57. The concentrations of the mixed liquor suspended solid (MLSS) and mixed liquor volatile suspended solid (MLVSS) were 4,560 and 3,170 mg/L, respectively, in the end phase, and the MLVSS/MLSS ratio decreased from 0.81 to 0.69. The sludge volume index (SVI30) decreased linearly from 88 to 58 mL/g. In the microbial community analysis, Nitrosomonas species accounted for 22.9% of the total bacteria in the initial phase, whereas Halomonas accounted for 43.2% in the end phase. Hence, the gradually increased salinity appears to facilitate the dominance of halophilic microorganisms in the long-term operation of an AGS-based biological treatment system and the stable retention of AGS.

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“…Researches had found that the relative abundance of Proteobacteria and Bacteroidetes can reach 46% and 51% in PNA and Proteobacteria was associated with ammonia oxidation and nitrite accumulation (Wei et al, 2018). Heterotrophic bacteria such as Chloroflexi and Bacteroidetes could consume polysaccharides and proteins in EPS to reduce nitrate to nitrite and provide substrate for anammox bacteria (Lawson et al, 2017; Li et al, 2018). Chloroflexi can also promote the aggregation of microorganisms (Liu et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

Analyzing the effect of organic carbon on partial nitrification‐anammox process based on metagenomics and quorum sensing

Xing

Liu

Zhang

et al. 2020

Water Environment Research

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The effects of adding organic carbon on the performance of different partial nitrification‐anammox (PNA) process (the activated sludge process and biofilm process) were studied, especially nitrogen removal, functional microbial activity, and microbial community structure. The potential influences of quorum sensing (QS) on the nitrogen metabolism were also analyzed. The results showed that the addition of organic carbon in biofilm systems could reduce total nitrogen (TN) removal percentages, while in activated systems it could increase TN removal percentages. The TN removal percentages in SBBR‐CN (the biofilm system with addition of organic carbon) and SBR‐CN (the activated sludge system with addition of organic carbon) were 15% and 45%, respectively, and those in SBBR‐N (the biofilm system without addition of organic carbon) and SBR‐N (the activated sludge system without addition of organic carbon) were 75% and 21%, respectively. Batch experiments have proved that organic carbon inhibited the activities of nitrite‐oxidizing bacteria (NOB) and anaerobic ammonia oxidation (anammox) bacteria, and organic carbon could promote the activity of denitrifying bacteria in activated sludge systems. Compared with activated sludge systems, biofilm systems could protect the activity of anammox bacteria. The relative abundances of ammonia oxidizing bacteria (AOB) and anammox bacteria were decreased, while the relative abundances of denitrifying bacteria (Thauera) were increased with the addition of organic carbon. The biofilm systems were more conducive to the growth of anammox bacteria. Metagenomics revealed that the same bacteria might be involved in different nitrogen metabolism, and nitrogen metabolism was achieved through the complex cooperation among functional bacteria. Besides, functional bacteria involving in the nitrogen metabolism had genes related to QS, indicating that QS might affect the nitrogen metabolism by regulating the functional bacteria activity. Practitioner points PNA was achieved through SBBR and complete nitrification was achieved through SBR under the low ammonia nitrogen concentration condition. The effect of organic carbon on biofilm and activated sludge PNA process was different under the low ammonia nitrogen concentration condition. QS and QQ may affect the nitrogen removal performance by regulating the expression of nitrogen metabolism‐related genes.

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System performance and microbial community succession in a partial nitrification biofilm reactor in response to salinity stress

Cited by 65 publications

References 48 publications

Plant Growth-Promoting Bacteria: Biological Tools for the Mitigation of Salinity Stress in Plants

Plant Growth-Promoting Bacteria: Biological Tools for the Mitigation of Salinity Stress in Plants

The effects of high salinity on nitrogen removal and the formation characteristics of aerobic granular sludge

Analyzing the effect of organic carbon on partial nitrification‐anammox process based on metagenomics and quorum sensing

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