The effect of Cu II ions in l- asparagine single crystals

Santana, Ricardo Costa de; Gontijo, Henrique O.; Menezes, Arthur F.; Martins, José A.; Carvalho, J. F.

doi:10.1016/j.physb.2016.08.007

Cited by 4 publications

(1 citation statement)

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“…L -asparagine is also closely associated with Cu and POC concentrations, as shown in Figures 3B,C . The results could possibly be explained by the previous study that copper ions can promote the crystal growth of L -asparagine ( Santana et al, 2016 ). Therefore, due to the presence of toxic heavy metals and retarded AWCD, the POC/SOC ratio, which represents the contribution of POC to SOC ( Nie et al, 2016 ), was lower in the sampled soils (POC/SOC ratio was 0.018, 0.025, 0.034, and 0.027% in the CK, corn field, citrus field and paddy field samples, respectively).…”

Section: Resultsmentioning

confidence: 75%

Influence of Altered Microbes on Soil Organic Carbon Availability in Karst Agricultural Soils Contaminated by Pb-Zn Tailings

Liu

Wang

et al. 2018

Front. Microbiol.

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Soil organic carbon (SOC) availability is determined via a complex bio-mediated process, and Pb-Zn tailings are toxic to the soil microbes that are involved in this process. Here, Pb-Zn-tailings- contaminated karst soils with different levels (paddy field > corn field > citrus field > control group) were collected to explore the intrinsic relationship between Pb-Zn tailings and microbes due to the limited microbial abundance in these soils. The SOC concentration in the paddy fields is the highest. However, based on the soil microbial diversity and sole-carbon-source utilization profiles, the rate of SOC availability, McIntosh index, Shannon-Wiener diversity index, Simpson’s diversity index and species richness are the lowest in the rice paddy soils. According to the results of Illumina sequencing of the 16S rRNA gene, Acidobacteria and Proteobacteria are the dominant phyla in all samples, accounting for more than 70% of the reads, while the majority of the remaining reads belong to the phyla Verrucomicrobia, Chloroflexi, Actinobacteria, Bacteroidetes, and Nitrospirae. We also observed that their class, order, family, genus and operational taxonomic units (OTUs) were dependent on SOC availability. Pearson correlation analysis reveals that L-asparagine utilization profiles show significant positive correlation with OTUs 24, 75, and 109 (r = 0.383, 0.350, and 0.292, respectively), and malic acid utilization profiles show significant positive correlation with OTUs 4, 5, 19, 27 (Bradyrhizobium), 32 (Burkholderia), 75 and 109 (r = 0.286, 0.361, 0.387, 0.384, 0.363, 0.285, and 0.301, respectively), as also evidenced by the redundancy analysis (RDA) biplot and heat map. These results indicate that the most abundant groups of bacteria, especially the uncultured facultative Deltaproteobacteria GR-WP33-30 (OTU 24), after long-term acclimation in heavy metal-contaminated soil, are associated with the variance of labile carbon source such as L-asparagine and may have considerable control over the stability of the vast SOC pool in karst surface soils with different agricultural land-use practices. These findings can expand our understanding of global soil-carbon sequestration and storage via changes in microbial community structure of the most abundant species.

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Section: Resultsmentioning

confidence: 75%