Origins, roles and fate of organic acids in soils: A review

Adeleke, Rasheed; Nwangburuka, Cyril C.; Oboirien, Bilainu

doi:10.1016/j.sajb.2016.09.002

Cited by 395 publications

(189 citation statements)

References 145 publications

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“…Notably, the use of soil microbial indicators has been proposed for soil quality monitoring because diversity and structure of microbial community are sensitive to natural or anthropogenic disturbances [7][8][9][10] . The suitability of microbes as bioindicators is supported by the direct relationship between the diversity of soil microbial communities and soil ecosystem function 2,[11][12][13] as well as the key roles of soil microorganisms in nutrient cycling, plant growth promotion, ecological succession and energy flow in soil ecological food webs 8,[14][15][16][17][18] . For the foregoing reasons and to determine the potential impact of such disturbances on soil health processes and function, several studies have investigated soil microbial community composition and function in anthropogenically-and naturally-disturbed environments 8,17,19,20 .…”

mentioning

confidence: 99%

Structural and functional differentiation of bacterial communities in post-coal mining reclamation soils of South Africa: bioindicators of soil ecosystem restoration

Ezeokoli

Bezuidenhout

Maboeta

et al. 2020

Sci Rep

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Soil microbial communities are suitable soil ecosystem health indicators due to their sensitivity to management practices and role in soil ecosystem processes. Presently, information on structural and functional differentiation of bacterial communities in post-coal mining reclamation soils of South Africa is sparse. Here, bacterial communities in three post-coal mining reclamation soils were investigated using community-level physiological profiling (CLPP), enzyme activities, and next-generation sequencing of 16S rRNA gene. Inferences were drawn in reference to adjacent unmined soils. CLPPbased species diversity and proportionality did not differ significantly (P > 0.05) whereas activities of β-glucosidase, urease and phosphatases were significantly (P < 0.05) influenced by site and soil history (reclaimed vs unmined). Bacterial communities were influenced (PERMANOVA, P < 0.05) by soil history and site differences, with several phylotypes differentially abundant between soils. Contrastingly, predicted functional capabilities of bacterial communities were not different (PERMANOVA, P > 0.05), suggesting redundancy in bacterial community functions between reclamation and unmined soils. Silt content, bulk density, pH, electrical conductivity, Na and Ca significantly influenced soil bacterial communities. Overall, results indicate that bacterial community structure reflects underlying differences between soil ecosystems, and suggest the restoration of bacterial diversity and functions over chronological age in reclamation soils. The soil ecosystem supports numerous interactions between living and non-living matter. These interactions are vital to the soil's ecological processes and key ecosystem services 1,2. However, anthropogenic disturbances of the soil ecosystem through agriculture, mining and other land use activities, negatively affect these vital interactions 3,4. Although relevant post-mining reclamation guidelines exist in South Africa for restoring mined-out areas to acceptable conditions 5 , appropriate comprehensive soil quality monitoring tools for ensuring the success of post-mining reclamation efforts are still lacking. Such soil quality monitoring tools will help elucidate the adequacy of current reclamation practices and could provide insights into the potential restoration of ecological roles. At present, several above-ground monitoring indicators for soil quality, including vegetation cover, erodibility, and compaction levels have been proposed and utilised on post-coal mining reclamation sites 6. However, these above ground indicators do not provide a comprehensive assessment of soil health given that the soil ecosystem

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mentioning

confidence: 99%

Structural and functional differentiation of bacterial communities in post-coal mining reclamation soils of South Africa: bioindicators of soil ecosystem restoration

Ezeokoli

Bezuidenhout

Maboeta

et al. 2020

Sci Rep

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“…By studying a few of its putative acid:CoA ligases, we have learned that the substrate specificity of these enzymes is broad, probably evolving in response to the richness of organic acids present in the soil, where this organism is found. In soil, organic acid concentration can be as high as 1 mM for monocarboxylic acids, and as high as 50 μM for polycarboxylates, providing soil bacteria with a plethora of carbon and energy to be extracted (Adeleke et al , ). Among the organic acid substrates activated by just a few of the S. lividans CoA ligases, our studies revealed that these enzymes can activate aliphatic linear, saturated and unsaturated, short and medium length and aromatic organic acids (Fig.…”

Section: Discussionmentioning

confidence: 99%

New AMP‐forming acid:CoA ligases from Streptomyces lividans, some of which are posttranslationally regulated by reversible lysine acetylation

Burckhardt

VanDrisse

Tucker

et al. 2019

Molecular Microbiology

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In nature, organic acids are a commonly used source of carbon and energy. Many bacteria use AMPforming acid:CoA ligases to convert organic acids into their corresponding acyl-CoA derivatives, which can then enter metabolism. The soil environment contains a broad diversity of organic acids, so it is not surprising that bacteria such as Streptomyces lividans can activate many of the available organic acids. Our group has shown that the activity of many acid:CoA ligases is posttranslationally controlled by acylation of an active-site lysine. In some cases, the modification is reversed by deacylases of different types. We identified eight new acid:CoA ligases in S. lividans TK24. Here, we report the range of organic acids that each of these enzymes can activate, and determined that two of the newly identified CoA ligases were under NAD + -dependent sirtuin deacylase reversible lysine (de)acetylation control, four were not acetylated by two acetyltransferases used in this work, and two were acetylated but not deacetylated by sirtuin. This work provides insights into the broad organic-acid metabolic capabilities of S. lividans, and sheds light into the control of the activities of CoA ligases involved in the activation of organic acids in this bacterium.

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“…The effects of SSB addition on the pH and EC of soil are shown in Figure 2. The pH of the control soil increased remarkably after planting, which indicated that the acid organic matter in soil was decomposed during Chinese cabbage planting [28]. Also, the addition of SSB adjusted the pH of soil from acidic to neutral and the pH increased from 7.12 to 7.49 after planting.…”

Section: Effects Of Ssb Addition On the Physicochemical Property Of Soilmentioning

confidence: 93%

Influence of Sewage Sludge Biochar on the Microbial Environment, Chinese Cabbage Growth, and Heavy Metals Availability of Soil

Yu¹,

Xie²,

Ma³

et al. 2019

Biochar - An Imperative Amendment for Soil and the Environment

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The effects of sewage sludge biochar (SSB) on the microbial environment, Chinese cabbage yield, and heavy metals (HMs) availability of soil were comprehensively investigated in this study. Results showed that the concentrations of the dehydrogenase (DHA) and urease in the soil added with 10% SSB were 3.60 and 1.67 times as high as that of the control soil, respectively, after planting; the concentrations of the bacteria, fungi, ammonia-oxidizing archaea (AOA), and ammonia-oxidizing bacteria (AOB) in the soil added with 10% SSB after planting reached 2.84, 2.62, 1.76, and 2.23 times, respectively, compared with those of the control group; the weights of the aboveground and underground parts of Chinese cabbage were 5.82 and 8.67 times as high as those of the control group, respectively. Moreover, the addition of SSB enhanced the immobilization of Cr, Ni, and Cd. All in all, SSB can improve the microbial environment of soil and inhibit the availability of HMs, which is very important for their utilization in barren soil.

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Origins, roles and fate of organic acids in soils: A review

Cited by 395 publications

References 145 publications

Structural and functional differentiation of bacterial communities in post-coal mining reclamation soils of South Africa: bioindicators of soil ecosystem restoration

Structural and functional differentiation of bacterial communities in post-coal mining reclamation soils of South Africa: bioindicators of soil ecosystem restoration

New AMP‐forming acid:CoA ligases from Streptomyces lividans, some of which are posttranslationally regulated by reversible lysine acetylation

Influence of Sewage Sludge Biochar on the Microbial Environment, Chinese Cabbage Growth, and Heavy Metals Availability of Soil

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