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Microbiological Research
Urban & Fischer Verlag DmbH & Co.
Microbiological Research

Urban & Fischer Verlag DmbH & Co.

0944-5013

Microbiological Research/Journal Microbiological ResearchSCIEIAHCI
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    Isolation of soybean-specific plant growth-promoting rhizobacteria using soybean agglutin and evaluation of their effects to improve soybean growth, yield, and soil nutritional status

    Ai, WenfengGuo, TingtingLay, Khien DucOu, Kangmiao...
    12页
    查看更多>>摘要：The basic requirements of plant growth-promoting rhizobacteria (PGPR) for field applications are that they have an affinity for the host plant and that they can colonize the rhizosphere. Here, a new technique was established using soybean agglutin (SBA) as a tool to isolate soybean-specific PGPR. Thirty-three PGPR strains with an affinity for soybean were obtained via the screening method with SBA. All 33 isolates were able to produce indole acetic acid and solubilize inorganic phosphate and potassium. Most isolates (93.94%) were able to solubilize organic phosphate and almost half (45.45%) were able to produce siderophores. More than 40% of the isolates exhibited all five plant growth-promoting traits. The isolate Enterobacter sp. strain DN9 was selected for further analyses of its rhizosphere colonization and soybean growth-promoting effects because of its excellent activity in phosphate and potassium solubilization. The luciferase luxAB gene was electrotransformed into DN9, and the labelled DN9 (DN9-L) was able to survive in the soybean rhizosphere and colonize new spaces as the soybean roots elongated. This strain positively affected root system development and soybean seedling growth. In pot and field experiments, the isolates DN9, DW1, and DW13 significantly increased the nutrient contents in rhizosphere soil and soybean leaves. On average, the seed number per plant and the seed weight per plant were increased by 20% and 24% respectively, in plants inoculated with these PGPR strains in the pot experiment. In a field experiment, compared with uninoculated plants, those inoculated with DW1 showed 46.78% higher pod number per plant and 5.23% higher seed oil content; those inoculated with DW13 showed 79.82% higher seed number per plant and 65.10% higher seed weight per plant; and those inoculated with DN9 showed 9.13% higher 100 seed weight. These results show that SBA can be used as a tool to isolate efficient PGPR to enhance soybean production.
      原文链接:
    • NSTL
    • Elsevier

    Redox status and metabolomic profiling of thioredoxin reductase inhibitors and 4 kGy ionizing radiation-exposed Deinococcus radiodurans

    Sudharsan, M.Prasad, N. RajendraKanimozhi, G.Rishiikeshwer, B. S....
    13页
    查看更多>>摘要：The gram-positive bacterium Deinococcus radiodurans can survive under extreme ionizing radiation environment. This study aims to rationalize the role of redox balance, antioxidant status, and metabolite content on the radiation survival of D. radiodurans. We found that the TrxR inhibitors, i.e., ebselen, auranofin, and epigallocatechin gallate (EGCG) (10 mu M) treatment affects the radiation survival of D. radiodurans. The TrxR inhibitors treatment affects the redox status, activities of antioxidant enzymes, increases the intracellular ROS levels and protein carbonylation upon 4 kGy ionizing radiation treatments. Moreover, the alteration in cellular redox status affects the metabolites content of the organism. In addition, we noticed differential metabolomic profiles in sham control, radiation control (4 kGy), and TrxR inhibitors plus radiation-treated D. radiodurans. The TrxR inhibitors plus radiation treated groups exhibit more variation compare to sham control and 4 kGy radiation-exposed D. radiodurans. Further, some novel metabolites can possess the high antioxidant property and involved in vital cellular metabolism were found in sham control and radiation treated cells of D. radiodurans. Thus, the results illustrate the role of intracellular redox status in the survival and metabolomic profile of D. radiodurans.
      原文链接:
    • NSTL
    • Elsevier

    Promoter regulation and genetic engineering strategies for enhanced cellulase expression in Trichoderma reesei (vol 259, 127011, 2022)

    Adnan, MuhammadMa, XuekunOlsson, StefanWang, Juan...
    1页
      原文链接:
    • NSTL
    • Elsevier

    Metagenomic analysis displays the potential predictive biodegradation pathways of the persistent pesticides in agricultural soil with a long record of pesticide usage

    Malla, Muneer AhmadDubey, AnamikaKumar, AshwaniYadav, Shweta...
    12页
    查看更多>>摘要：Microbes are crucial in removing various xenobiotics, including pesticides, from the environment, specifically by mineralizing these hazardous pollutants. However, the specific procedure of microbe-mediated pesticide degradation and its consequence on the environment remain elusive owing to limitations in culturing techniques. Therefore, in this study, we have investigated i) the physicochemical and elemental compositions of PCAS (pesticide-contaminated agricultural soils) and NS (natural soils); ii) the bacterial communities and degradation pathways, as well as some novel biodegradation genes (BDGs) and pesticide degradation genes (PDGs) across two different landscapes (PCAS and NS) by applying high-throughput sequencing. The chemical and elemental composition analyses showed that all nutrients (P, K, N, S, Mn, B, and Zn) were significantly higher in PCAS than in NS (p <= 0.05). The results of the 16S rRNA amplicon sequencing analysis of pesticide-contaminated (PCAS-1, PCAS-2, PCAS-3, PCAS-4) samples showed that the relative abundance of the phylum Proteobacteria (30-36%) > Actinobacteria (15-20%) > Firmicutes (13-14%) > Bacteroidetes (7-13%), were higher compared to the natural soil (NS-1, NS2). Consistent with this, a phylogenetic shift was observed with (alpha, beta, and gamma Proteobacteria) being abundant in PCAS, whereas delta and epsilon groups were more prevalent in NS. The functional characterization of the PCAS and NS by PICRUSt2 revealed that bacterial communities play a significant role in pesticide metabolism. Predictive metagenome analysis of contaminated soils showed the role of core degrading genes in membrane transport, stress response, regulatory genes, resource transport, and environmental sensing. Furthermore, 14 BDGs and 30 PDGs were examined, with a relative abundance of 0.081-1.029 % and 0.107-0.8903 % in each PCAS, respectively. The major BDGs and PDGs, with the compounds they hydrolyze, include ppo (polyphenol oxidase and laccase), CYP (cytochrome p450 protein), lip gene (lignin peroxidase), similarly, among the PDGs mhel (carbendazim), opd (organophosphate), mpd (methyl parathion), atzA, atzB, atzD, atzF and trzN (atrazine), chd (chlorothalonil), hdx (metamitron), hdl-1 (isoproturon) and fmo (nicosulfuron). Overall, our findings demonstrated the significance of utilizing metagenomic methods to predict microbial aided degradation in the ecology of contaminated environments.
      原文链接:
    • NSTL
    • Elsevier

    Microbiome-based screening and co-fermentation of rhizospheric microorganisms for highly ginsenoside Rg(3) production

    Qi, GeyuanJi, BaoyuZhang, YananHuang, Luqi...
    16页
    查看更多>>摘要：Ginsenoside Rg3 has a wide range of pharmacological activities and application value while the content of Rg3 in Panax plants is extremely low. The interaction between medicinal plants and microorganisms will be beneficial to produce active compounds by biotechnology. In this study, the rhizosphere soil samples from different P. notoginseng producing areas (Asanlong, Huilong, Demonstration garden) were collected to analyze the soil microflora characteristics by Illumina MiSeq sequencing technology. Based on the highest contents of ginsenosides in Huilong, the first, second, and the specificity dominant strains were predicted and the database was established. Besides, a total of 6 strains of bacteria and 3 strains of fungi were isolated from the soil of P. notoginseng. Among them, F24 was identified as Chaetomium sp, which was not only consistent with the second dominant strain of P. notoginseng predicted in the database, but also had a high level of Rg3. It also indicated that the method of screening the dominant strains in soil was reasonable and the database was reliable. Through the optimization of fermentation conditions, the highest yield of Rg3 was obtained when F24 was cultured in the medium supplemented with 8 mg/L glucose and 5 mg/L methyl jasmonate (MeJA) for 7 days. On this basis, the yield of ginsenoside Rg3 in shake flask reached 108.95 mg/L (4.93 mg/g, ~4.2-fold higher than cultivated P. notoginseng plants) by the co-fermentation with A. niger in a concentration ratio of 2:1. The increase of Rg3 yield mainly came from the conversion of other 20S-protopanaxdiol saponins into Rg3 by beta-glucosidase in A. niger. In addition, the expression levels of ginsenoside biosynthesis genes in different strains were compared, it was found that the expression of key genes was significantly increased after co-fermentation. This research provided certain theoretical and technical support for the large-scale industrial production of ginsenoside Rg3 by microbiology.
      原文链接:
    • NSTL
    • Elsevier