Bacterial Diversity and Community Structure in the Rhizosphere of Four Halophytes

Li, Mingyuan; Wang, Jilian; Tuo, Yao; Zhang, Tian; Zhou, Qian; Mutallip, Mihray

doi:10.1007/s00284-021-02536-3

Cited by 11 publications

(7 citation statements)

References 42 publications

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“…Proteobacteria and Actinobacteria were the dominant phyla in all soil samples, consistent with other reports ( 31 , 32 ). The properties of Proteobacteria , a slightly acidic and metabolically diverse species, can explain the high presence of these in soil samples ( 33 ).…”

Section: Discussionsupporting

confidence: 92%

“…The results in Figures 2C, D indicate that the microbial community significantly decreased after being polluted with Cr(VI). Proteobacteria and Actinobacteria were the dominant phyla in all soil samples, consistent with other reports (31,32). The properties of Proteobacteria, a slightly acidic and metabolically diverse species, can explain the high presence of these in soil samples (33).…”

Section: Discussionsupporting

confidence: 90%

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Changes in the bacterial communities in chromium-contaminated soils

et al. 2023

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IntroductionHexavalent chromium or Cr(VI) is essential to various industries, such as leather manufacturing and stainless steel production. Given that inevitable leakage from industries pollutes the soil and thereby affects the soil environment. Microbial communities could improve the quality of the soil. Abundant bacterial communities would significantly enhance the soil richness and resist external pressure, benefiting agriculture. But the pollution of heavy metal broke the balance and decrease the abundance of bacterial communities, which weak the self-adjust ability of soil. This study aimed to explore changes in the diversity of soil bacterial communities and to identify the influences of soil bacterial communities on enzymes in soil polluted by Cr(VI).MethodsThe target soils were sampled quickly and aseptically. Their chromium content was detected through inductively coupled plasma-mass spectrometry, and bacterial microbiome communities were explored through MiSeq high-throughput sequencing. Then, the content of nitrite reductase and catalases were investigated through enzyme-linked immunosorbent assay (ELISA).ResultsChromium content in polluted soils was higher than that in the control soils at all depths. Sobs, Chao1, Ace, and Shannon diversity estimators in the control were higher, whereas Simpson's diversity estimators in the control soils were lower than those of contaminated samples at all depths. Contaminants affected the composition of the bacterial community. The soil microbial species were relatively single and inhomogeneous in the polluted soils. The bacterial phyla in polluted and controlled soils include Proteobacteria, Actinobacteria, Chloroflexi, and Acidobacteria, which differ markedly in abundance.DiscussionThe results of these observations provide insights into the ecotoxicological effects of Cr(VI) exposure to soil microorganisms. To sum up these results are critical for evaluating the stabilized state of microbial community structures, contributing to the assessment of the potential risk of metal accumulation in soils.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 90%

Changes in the bacterial communities in chromium-contaminated soils

et al. 2023

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“…Furthermore, our results indicated that geographic distance critically contributed to the assembly of the three minor grain crop communities. We noticed that NO 3 was positively correlated with the richness of proso millet and sorghum rhizosphere bacteria, but negatively associated with the richness of sorghum rhizosphere bacteria, which may be attributed to different habitat specificity and root exudates, leading to differential variations in rhizosphere soil nutrient levels and bacterial diversity (Badri & Vivanco, 2009; Li et al, 2021; Raaijmakers et al, 2009). Soil pH and MAT were the two significant predictors of rhizosphere bacterial community similarity for all the minor grain crops.…”

Section: Discussionmentioning

confidence: 95%

Rhizosphere bacterial communities of three minor grain crops exhibit distinct environmental adaptations and assembly processes

Tian¹,

Zhang²,

Chen³

et al. 2022

European J Soil Science

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Deciphering responses of bacterial communities to environmental change, and understanding how communities assemble in response to environmental change, are important subjects. The assembly processes governing the rhizosphere bacterial communities of minor grain crops are rarely explored based on regional scales, especially in terms of the environmental adaptation. Here, we investigated the environmental thresholds and phylogenetic signals for ecological preferences of rhizosphere bacterial communities of three minor grain crop taxa across complex environmental gradients to reflect their environmental adaptation. Additionally, we reported environmental factors affecting their community assembly processes based on a large‐scale soil survey in agricultural fields across northern China using high‐throughput sequencing. The results demonstrated a narrower range of environmental thresholds and weaker phylogenetic signals for the ecological traits of rhizosphere bacteria in proso millet than in foxtail millet and sorghum fields. The proso millet rhizosphere community was the most phylogenetically clustered. Null model analysis indicated that homogeneous selection belonging to deterministic processes governed the sorghum rhizosphere community, whereas dispersal limitation belonging to stochastic processes was the critical assembly process in the foxtail millet and proso millet. Mean annual temperature was the decisive factor for adjusting the balance between stochasticity and determinism of the foxtail millet, proso millet and sorghum rhizosphere communities. A higher temperature resulted in stochasticity in the proso millet and sorghum communities. For the foxtail millet community, the deterministic assembly increased with an increase in temperature. These results contribute to the understanding of rhizosphere‐associated bacterial community assembly processes in agro‐ecosystems on a large scale. Highlights Proso millet rhizosphere bacterial taxa exhibited weaker environmental adaptation than foxtail millet and sorghum taxa. Determinism governed the sorghum rhizosphere community, whereas stochasticity was the critical assembly process in the foxtail and proso millet. Mean annual temperature mediated balance between stochastic and deterministic processes.

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“…We know that soil parameters have correlations with rhizosphere soil microorganisms. For example, the TN and TP of soil affected the most dominant phyla, such as Firmicutes, Proteobacteria, Actinobacteria, and Bacteroidetes among halophytes [55]. TP negatively correlated with Gematimonadetes under salt conditions [56].…”

Section: Discussionmentioning

confidence: 99%

Enhancing Resistance to Salinity in Wheat by Using Streptomyces sp. HU2014

Zhu,

Hu,

Rozhkova

et al. 2023

Agronomy

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Salt stress affects the growth and global production of wheat (Triticum aestivum L.). Plant growth-promoting microbes can enhance plant resistance to abiotic stresses. In this study, we aimed to assess the inoculation of soil with Streptomyces sp. HU2014 to improve wheat tolerance to salt stress from multiple perspectives, including the interaction of the strain, the addition of NaCl, the condition of the wheat, and rhizosphere microbial communities. The results showed that the strain promoted wheat growth under NaCl stress by increasing biomass by 19.8%, total chlorophyll content by 72.1%, proline content by 152.0%, and malondialdehyde content by 106.9%, and by decreasing catalase by 39.0%, peroxidase by 1.4%, and soluble sugar by 61.6% when compared to the control. With HU2014 soil inoculation, total nitrogen, nitrate nitrogen, total phosphorus, and Olsen phosphorus increased, whereas ammonium nitrogen and pH decreased. HU2014 inoculation and/or the addition of NaCl affected the diversity of rhizosphere bacteria, but not fungi. The structure of the microbial community differed after HU2014 inoculation, with Proteobacteria, Acidobacteriota, Bacteroidota, and unclassified fungi being the dominant phyla, and these taxa correlated with the above-mentioned soil parameters. Thus, this study provided a promising way to enhance wheat tolerance to salt stress and improve the agricultural ecological environment by using plant growth-promoting microbes.

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Bacterial Diversity and Community Structure in the Rhizosphere of Four Halophytes

Cited by 11 publications

References 42 publications

Changes in the bacterial communities in chromium-contaminated soils

Changes in the bacterial communities in chromium-contaminated soils

Rhizosphere bacterial communities of three minor grain crops exhibit distinct environmental adaptations and assembly processes

Enhancing Resistance to Salinity in Wheat by Using Streptomyces sp. HU2014

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