Isolation and characterization of mineral-dissolving bacteria from different levels of altered mica schist surfaces and the adjacent soil

Wang, Yuan Li; Wang, Qi; Yuan, Rui; Sheng, Xiafang; Lin, Hong

doi:10.1007/s11274-018-2573-x

Cited by 11 publications

(4 citation statements)

References 47 publications

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“…Despite the pivotal role of microbial communities in rock weathering, the protagonists and the mechanisms of these processes are not very clear. Different mechanisms and rock weathering-enhancing organisms have been reported in studies of soil isolates of both bacteria ( Frey et al, 2010 ; Lepleux et al, 2012 ; Liu et al, 2012 ; Olsson-Francis et al, 2015 ; Xi et al, 2018 ; Wang et al, 2019 ) and fungi ( Brunner et al, 2011 ), observing the production of organic acids (e.g., oxalate) and hydrogen cyanide (HCN) to mobilize the nutrients such as iron sulfur and phosphorus ( El-Tarabily et al, 2008 ), and an increase in siderophore production to import iron into the cell ( Frey et al, 2010 ; Wongfun et al, 2014 ; Olsson-Francis et al, 2015 ). Compared to rock weathering processes, diazotrophic organisms are better understood and characterized.…”

Section: Introductionmentioning

confidence: 99%

A Taxon-Wise Insight Into Rock Weathering and Nitrogen Fixation Functional Profiles of Proglacial Systems

2021

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The Arctic environment is particularly affected by global warming, and a clear trend of the ice retreat is observed worldwide. In proglacial systems, the newly exposed terrain represents different environmental and nutrient conditions compared to later soil stages. Therefore, proglacial systems show several environmental gradients along the soil succession where microorganisms are active protagonists of the soil and carbon pool formation through nitrogen fixation and rock weathering. We studied the microbial succession of three Arctic proglacial systems located in Svalbard (Midtre Lovénbreen), Sweden (Storglaciären), and Greenland (foreland close to Kangerlussuaq). We analyzed 65 whole shotgun metagenomic soil samples for a total of more than 400 Gb of sequencing data. Microbial succession showed common trends typical of proglacial systems with increasing diversity observed along the forefield chronosequence. Microbial trends were explained by the distance from the ice edge in the Midtre Lovénbreen and Storglaciären forefields and by total nitrogen (TN) and total organic carbon (TOC) in the Greenland proglacial system. Furthermore, we focused specifically on genes associated with nitrogen fixation and biotic rock weathering processes, such as nitrogenase genes, obcA genes, and genes involved in cyanide and siderophore synthesis and transport. Whereas we confirmed the presence of these genes in known nitrogen-fixing and/or rock weathering organisms (e.g., Nostoc, Burkholderia), in this study, we also detected organisms that, even if often found in soil and proglacial systems, have never been related to nitrogen-fixing or rock weathering processes before (e.g., Fimbriiglobus, Streptomyces). The different genera showed different gene trends within and among the studied systems, indicating a community constituted by a plurality of organisms involved in nitrogen fixation and biotic rock weathering, and where the latter were driven by different organisms at different soil succession stages.

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Section: Introductionmentioning

confidence: 99%

A Taxon-Wise Insight Into Rock Weathering and Nitrogen Fixation Functional Profiles of Proglacial Systems

2021

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“…A considerable release of K, Ca, Mg, and active phosphorus by soil microbes in X-45 treated soil was observed through rock weathering experiments. In addition to the decrease in pH ( Wang et al, 2018 ), previous studies have shown that microbes could secrete H + to dissolve minerals, validating the acidification effect of microbes ( Azaiez et al, 2018 ). In this study, the rock weathering ability of microbial strain X-45 accelerated the soil formation process, improved the soil quality, and provided mineral nutrients required for plant growth.…”

Section: Discussionmentioning

confidence: 74%

Study of the effect of bacterial-mediated legume plant growth using bacterial strain Serratia marcescens N1.14 X-45

Zheng

Liu²,

Liu³

et al. 2022

Front. Microbiol.

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Soil microorganisms play an indispensable role in plant growth and are widely used to promote plant growth. However, poor microbial strains are homogeneous. The heavy application of chemical fertilizers and pesticides to agricultural soil has adversely affected the soil flora, necessitating the regulation of the soil flora to maintain soil health. In this study, X-45, a highly efficient and phosphorus-dissolving strain of the lysogenic bacterium Serratia marcescens N1.14 was isolated from bare rock slope soil samples from Yueyang Avenue, Hunan Province, China. We observed that microbial strain X-45 could release P from the rocks into solution when the sample rocks were used as the only phosphorus source. Furthermore, we observed that the P content in media increased by 3.08 X compared to the control. After applying X-45 as a bacterial fertilizer, the growth of potted Indigofera pseudotinctoria plants significantly increased, the soil physicochemical properties were significantly improved, and the relative abundance of Bradyrhizobium in the soil increased significantly from 1 to 42%. Besides, Bradyrhizobium became the most dominant genus in the soil. The indirect promotion of another beneficial microorganism by X-45 further revealed the intrinsic mechanism by which X-45 exerted its effect on plant promotion and soil improvement. Using this bacteria, the hypothesis of the superposition effect of legume plant promotion was also confirmed.

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“…Bacillus strains, in particular, are highly appealing due to their capacity to generate cellulase-free extracellular xylanases at substantial levels, and these enzymes remain stable even in high-temperature and alkaline pH conditions [7]. Xylanases have a wide range of biotechnological applications, including improving the digestibility and feed absorption of livestock when added to animal feed, facilitating dough handling and improving bakery product quality in baking, clarifying fruit juices using pectinase and cellulase, improving fiber quality in the textile industry, and decreasing chlorine consumption for pulp bleaching in the pulp and paper industry [8][9][10]. In summary, this investigation extensively explores xylanase production, purification, and characterization, along with Original Article practical evaluations of its performance in critical industrial processes.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the efficiency and functionality of xylanase from Bacillus sp. RTS11: Optimization, purification, characterization, and prospects in kraft pulp bleaching

Sara Sahnoun,

Bilal Yahiaoui,

Aicha Benlounissi

et al. 2024

Cell Mol Biol (Noisy-le-grand)

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Bacillus sp. RTS11, a xylanolytic strain, was isolated from the Algerian Sahara desert rocks. Genetic analysis revealed a remarkable 98.69% similarity to Bacillus pumilus. We harnessed optimization techniques, including Plackett-Burman screening and Box-Behnken optimization design to amplify xylanase production and activity. The outcome of these efforts was an optimized medium that yielded an impressive xylanase production titer of 448.89 U, a threefold increase compared to the non-optimized medium (146 U). The purification of xylanase was achieved through the three-phase partitioning technique, employing t-butanol and various chromatographic methods. Notably, anion exchange chromatography led to isolating a highly pure enzyme with a molecular weight of 60 kDa. The xylanase exhibited its peak activity at a temperature of 60°C and a pH of 9.0. When applied to pulp pretreatment, 20 U/g of xylanase demonstrated a substantial increase in the release of phenolic and chromophore compounds while reducing sugar content in the pulp. Furthermore, this versatile xylanase shows its ability to efficiently hydrolyze a variety of agro-industrial residues, including wheat bran, corn and grape waste, wheat straw, and sugarcane bagasse. These findings underscore the significant potential of this xylanase enzyme in biobleaching processes and the utilization of agro-industrial waste, opening up exciting avenues for sustainable and environmentally friendly industrial applications.

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Isolation and characterization of mineral-dissolving bacteria from different levels of altered mica schist surfaces and the adjacent soil

Cited by 11 publications

References 47 publications

A Taxon-Wise Insight Into Rock Weathering and Nitrogen Fixation Functional Profiles of Proglacial Systems

A Taxon-Wise Insight Into Rock Weathering and Nitrogen Fixation Functional Profiles of Proglacial Systems

Study of the effect of bacterial-mediated legume plant growth using bacterial strain Serratia marcescens N1.14 X-45

Enhancing the efficiency and functionality of xylanase from Bacillus sp. RTS11: Optimization, purification, characterization, and prospects in kraft pulp bleaching

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