Root nodules of Genista germanica harbor Bradyrhizobium and Rhizobium bacteria exchanging nodC and nodZ genes

Kalita, Michał; Małek, Wanda

doi:10.1016/j.syapm.2019.126026

Cited by 8 publications

(3 citation statements)

References 54 publications

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“…Bradyrhizobium is a Gram-negative soil bacterium with nitrogen fixation capabilities [53]. Stenotrophomonas and Bradyrhizobium are genera that belong to the phylum Proteobacteria, characteristic of the oral cavity [54] and found in soil and plant roots [55], respectively. The leguminous, possibly included in the maternal diet, might be responsible for the presence of the genus [56].…”

Section: Discussionmentioning

confidence: 99%

Meconium Microbiota Composition and Association with Birth Delivery Mode

Rocha-Viggiano

Aranda‐Romo

Salgado‐Bustamante

et al. 2022

Advanced Gut & Microbiome Research

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Recently, the intrauterine sterile environment theory has been questioned. Growing evidence shows that microbial in utero pioneer gut colonization could occur prebirth, and this initial colonization may play an important role in the development of the neonate immune system and setting up a niche for the adult-like microbiota. In this study, we compared the microbiota networks from public available meconium datasets from different countries. The findings showed differences at the genera level and were country-dependent. We generated and analyzed bacterial networks, at the genera level of meconium samples from c-section and vaginally delivery modes. Interestingly, bacterial networks from the c-section-delivered meconium samples tended to have a bigger diameter but fewer correlations, whereas the vaginally delivered meconium networks were smaller and with a higher number of correlations. Even more, the networks were similar in the delivery mode, even between countries, at the genera level. The c-section networks suggest incomplete colonization or important lack of bacteria, promoting the susceptibility of the network to receive new members, beneficial or pathogens. These results suggest that the network analysis contributes to the knowledge of microbiota composition, identifying microbial associations, despite the differences between the environment and country habits, and obtaining a better understanding of microbial gut colonization.

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Section: Discussionmentioning

confidence: 99%

Meconium Microbiota Composition and Association with Birth Delivery Mode

Rocha-Viggiano

Aranda‐Romo

Salgado‐Bustamante

et al. 2022

Advanced Gut & Microbiome Research

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“…OTU2806 (Nitrosospira multiformis) and OTU3942 (Nitrosospira tenuis), which play a pivotal role in the nitri cation process (Lin et al, 2018), were enriched in the bulk soils with RT and rhizosphere soils with NT. OTU4404 (Bradyrhizobium japonicum) and OTU2109 (Rhizobium etli) are widely documented to facilitate nodulation and biological nitrogen xation of legumes (Kalita and Malek, 2020;Rivas et al, 2009;Roper et al, 2020), and they increased in the rhizosphere soils with NT and RT. Therefore, given the changes in the relative abundances of the bacterial taxa associated with carbon and nitrogen cycling in the soils with NT and RT compared with that with MP, we speculate that conservation tillage might enhance the soil nitrogen cycle and weaken soil carbon degradation.…”

Section: Variations In Soil Bacterial Community Compositions Induced ...mentioning

confidence: 99%

Conservation tillage regulates the assembly, network structure and ecological function of the soil bacterial community in black soils

Liu

Liang

et al. 2022

Plant Soil

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Conventional tillage is a serious threat to the stability of soil ecosystems. Understanding the response mechanisms of soil microbial community assemblies to anthropogenic activities is a major topic of ecological research. MethodsHere, we investigated the bacterial community structures and assemblies in bulk and rhizosphere soils of soybeans grown with conventional tillage (moldboard plow, MP) and with conservation tillage that involved no-tillage (NT) or ridge tillage (RT) using high-throughput sequencing methods. ResultsWe found that soil bacterial community compositions, structures and assembly processes were primarily altered by tillage practices. Brie y, in comparison to MP, NT and RT increased the relative abundances of the nitrogen-xing bacteria Mesorhizobium sp., Bradyrhizobium sp. and Burkholderia sp., but decreased the abundance of soil carbon-degrading bacteria, especially Blastococcus sp., Streptomyces sp. and Sphingomonas sp. In addition, in comparison to MP, NT and RT resulted in more stable bacterial networks and more lower the relative contribution of homogenizing dispersal. Soil pH was the primary soil factor regulating both the bacterial community structures and assembly processes under the three tillage practices. ConclusionsThe altered functional bacteria under conservation tillage was mostly a liated with biomarkers and keystone taxa, inferring that conservation tillage might contribute to biological nitrogen xation and soil carbon sequestration.

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“…For example, potential plant pathogens Fusarium ( Bai et al., 2015 ), Clonostachys ( Bienapfl et al., 2012 ), Lectera ( Liu et al., 2019 ) and Pythium ( Bai et al., 2015 ) have been widely reported to cause soybean root rot and impair soybean growth. In contrast, potentially beneficial microbes, such as Blastococcus ( Wang et al., 2020b ), Trichosporon ( Sláviková et al., 2002 ), Bradyrhizobium ( Kalita and Malek, 2020 ) and Rhizobacter ( Khan et al., 2015 ), can promote plant growth by participating in nitrogen fixation or organic matter degradation and increasing soil nutrient acquisition. Other species of potentially beneficial microbes, such as Trichoderma ( Zhang et al., 2019 ), Pseudomonas ( Zhou and Wu, 2018 ), Beauveria ( Vega et al., 2008 ) and Hirsutella ( Mwaheb et al., 2017 ), can protect plants from potential plant pathogens or soybean cyst nematode infestation by inducing systemic defense responses.…”

Section: Introductionmentioning

confidence: 99%

Chitin amendments eliminate the negative impacts of continuous cropping obstacles on soil properties and microbial assemblage

Fan

Liu

et al. 2022

Front. Plant Sci.

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Continuous cropping of soybean leads to soil environment deterioration and soil-borne disease exacerbation, which in turn limits the sustainability of agricultural production. Chitin amendments are considered promising methods for alleviating soybean continuous cropping obstacles; however, the underlying mechanisms of soil sickness reduction remain unclear. In this study, soil amendments with pure and crude chitin at different addition dosages were employed to treat diseased soil induced by continuous cropping of soybean for five years. Chitin amendments, especially crude chitin, remarkably increased soil pH, available phosphorus (AP), potassium (AK) and nitrate nitrogen ( NO3−-N) contents, and improved soybean plant growth and soil microbial activities (FDA). Additionally, chitin application significantly enriched the relative abundances of the potential biocontrol bacteria Sphingomonas, Streptomyces, and Bacillus and the fungi Mortierella, Purpureocillium, and Metarhizium while depleted those of the potential plant pathogens Fusarium, Cylindrocarpon and Paraphoma. Moreover, chitin amendments induced looser pathogenic subnetwork structures and less pathogenic cooperation with other connected microbial taxa in the rhizosphere soils. The structural equation model (SEM) revealed that pure and crude chitin amendments promoted soybean plant growth by indirectly regulating soil pH-mediated soil microbial activities and potentially beneficial microbes, respectively. Therefore, the reduction strategies for continuous cropping obstacles by adding pure and crude chitin were distinct; pure chitin amendments showed general disease suppression, while crude chitin exhibited specific disease suppression. Overall, chitin amendments could suppress potential plant pathogens and improve soil health, thereby promoting soybean growth, which provides new prospects for cultivation practices to control soybean continuous cropping obstacles.

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Root nodules of Genista germanica harbor Bradyrhizobium and Rhizobium bacteria exchanging nodC and nodZ genes

Cited by 8 publications

References 54 publications

Meconium Microbiota Composition and Association with Birth Delivery Mode

Meconium Microbiota Composition and Association with Birth Delivery Mode

Conservation tillage regulates the assembly, network structure and ecological function of the soil bacterial community in black soils

Chitin amendments eliminate the negative impacts of continuous cropping obstacles on soil properties and microbial assemblage

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