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  1. Article: Cowpea nodules host a similar bacterial community regardless of soil properties

    Amorim, Marineide Rodrigues / Mendes, Lucas William / Antunes, Jadson Emanuel Lopes / Oliveira, Louise Melo de Souza / Melo, Vania Maria Maciel / Oliveira, Francisca Andrea Silva / Aquino, Joao Pedro Alves / Rocha, Sandra Mara Barbosa / Pereira, Arthur Prudêncio de Araujo / da Costa, Antonio Félix / Oliveira, José de Paula / Araujo, Fabio Fernando / Figueiredo, Marcia do Vale Barreto / Araujo, Ademir Sérgio Ferreira

    Applied soil ecology. 2022 Apr., v. 172

    2022  

    Abstract: Nodulation results of a host-specific association between rhizobia and leguminous plants. However, it has been observed a rich and diverse bacterial community inside nodules. This study assessed the bacterial community in nodule of cowpea grown in sites ... ...

    Abstract Nodulation results of a host-specific association between rhizobia and leguminous plants. However, it has been observed a rich and diverse bacterial community inside nodules. This study assessed the bacterial community in nodule of cowpea grown in sites with distinct soil properties to address the hypothesis that these differences could influence the bacterial community inside the nodules. Soil samples and nodules of cowpea were collected in six different sites from Northeastern, Brazil. There was a different bacterial community structure and composition comparing bulk soil and nodules, with lower diversity in the last. However, the bacterial communities inside the nodules were not different comparing all sites. The bacterial communities found inside the nodules belonged to Proteobacteria (Bradyrhizobium and Rhizobium with 97% and 2.63%, respectively), Actinobacteria (Conexibacter and Amycolatopsis with 0.047% and 0.015%, respectively), and Firmicutes (Bacillus and Salipaludibacillus with 0.042% and 0.040%, respectively). Our analysis also showed that bulk soil and nodules presented 99.3% and 0.03% of exclusive OTUs, respectively, while these pools shared 0.4% of the bacterial groups. These results indicate that cowpea selected a specific bacterial group that colonizes the nodules, and it is not influenced by soil properties.
    Keywords Amycolatopsis ; Bradyrhizobium ; Fabaceae ; Rhizobium ; bacterial communities ; community structure ; cowpeas ; host specificity ; nodulation ; soil ecology ; Brazil
    Language English
    Dates of publication 2022-04
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1196758-4
    ISSN 0929-1393
    ISSN 0929-1393
    DOI 10.1016/j.apsoil.2021.104354
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: Bacillus thuringiensis endotoxin production: a systematic review of the past 10 years.

    Duarte Neto, José Manoel W / Wanderley, Maria Carolina de A / da Silva, Túlio Alexandre F / Marques, Daniela A Viana / da Silva, Gilvanda R / Gurgel, Josimar Fernandes / Oliveira, José de Paula / Porto, Ana Lúcia F

    World journal of microbiology & biotechnology

    2020  Volume 36, Issue 9, Page(s) 128

    Abstract: Bacillus thuringiensis (Bt) is one of the most promising biological control agents used commercially. Its products can contribute to reducing ecological and environmental problems associated with the use of chemical pesticides. Among the limiting factors ...

    Abstract Bacillus thuringiensis (Bt) is one of the most promising biological control agents used commercially. Its products can contribute to reducing ecological and environmental problems associated with the use of chemical pesticides. Among the limiting factors of using Bt as bioinsecticide are the costs and ensuring its biological activity, which may vary according to the strain and culture conditions. This systematic review aimed to collect state-of-the-art information on the production of Bt endotoxins and to score the methodological feasibility of the data obtained, thus highlighting possible incoherencies. In order to consolidate recent findings and guide future studies, a total of 47 original articles from the last 10 years was analysed, with special attention being given to corroborating data, identifying inconsistencies and suggesting future adjustments so as to increase data reliability. With a maximum score of 8 points, three production parameters were classified on the following scale: preferable (score: 2), adequate (score: 1) and inadequate (score: 0), and another two parameter were classified as adequate (score: 1) or inadequate (score: 0). No article scored more than 6 out of the maximum of 8, thus reflecting the need for more detailed studies regarding Bt endotoxin production. The lack of standardization of methods and units of measurement also have made a comparison of results and an overall analysis difficult. Standards are suggested in the present study. The inclusion of bioassays and quantifying toxin via alkaline dilution are strongly recommended for studies of this nature, along with LC50 expressed in mg/L. Sixteen articles (34%) did not use either of these suggested methods, which indicates the need for further supporting studies. These findings reinforce the need for robust studies in this area, which could include the development of more affordable and effective bioinsecticides, thus increasing their competitiveness against insecticides derived from unsustainable sources.
    MeSH term(s) Animals ; Bacillus thuringiensis/metabolism ; Bacillus thuringiensis Toxins/analysis ; Bacillus thuringiensis Toxins/biosynthesis ; Biological Assay ; Biological Control Agents ; Databases, Factual ; Endotoxins/analysis ; Endotoxins/biosynthesis ; Insecticides/pharmacology ; Larva/drug effects ; Pest Control, Biological
    Chemical Substances Bacillus thuringiensis Toxins ; Biological Control Agents ; Endotoxins ; Insecticides
    Language English
    Publishing date 2020-07-26
    Publishing country Germany
    Document type Journal Article ; Systematic Review
    ZDB-ID 1499109-3
    ISSN 1573-0972 ; 0959-3993
    ISSN (online) 1573-0972
    ISSN 0959-3993
    DOI 10.1007/s11274-020-02904-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Bacillus thuringiensis endotoxin production: a systematic review of the past 10 years

    Duarte Neto, José Manoel W / Wanderley, Maria Carolina de A / da Silva, Túlio Alexandre F / Marques, Daniela A. Viana / da Silva, Gilvanda R / Gurgel, Josimar Fernandes / Oliveira, José de Paula / Porto, Ana Lúcia F

    World journal of microbiology & biotechnology. 2020 Sept., v. 36, no. 9

    2020  

    Abstract: Bacillus thuringiensis (Bt) is one of the most promising biological control agents used commercially. Its products can contribute to reducing ecological and environmental problems associated with the use of chemical pesticides. Among the limiting factors ...

    Abstract Bacillus thuringiensis (Bt) is one of the most promising biological control agents used commercially. Its products can contribute to reducing ecological and environmental problems associated with the use of chemical pesticides. Among the limiting factors of using Bt as bioinsecticide are the costs and ensuring its biological activity, which may vary according to the strain and culture conditions. This systematic review aimed to collect state-of-the-art information on the production of Bt endotoxins and to score the methodological feasibility of the data obtained, thus highlighting possible incoherencies. In order to consolidate recent findings and guide future studies, a total of 47 original articles from the last 10 years was analysed, with special attention being given to corroborating data, identifying inconsistencies and suggesting future adjustments so as to increase data reliability. With a maximum score of 8 points, three production parameters were classified on the following scale: preferable (score: 2), adequate (score: 1) and inadequate (score: 0), and another two parameter were classified as adequate (score: 1) or inadequate (score: 0). No article scored more than 6 out of the maximum of 8, thus reflecting the need for more detailed studies regarding Bt endotoxin production. The lack of standardization of methods and units of measurement also have made a comparison of results and an overall analysis difficult. Standards are suggested in the present study. The inclusion of bioassays and quantifying toxin via alkaline dilution are strongly recommended for studies of this nature, along with LC50 expressed in mg/L. Sixteen articles (34%) did not use either of these suggested methods, which indicates the need for further supporting studies. These findings reinforce the need for robust studies in this area, which could include the development of more affordable and effective bioinsecticides, thus increasing their competitiveness against insecticides derived from unsustainable sources.
    Keywords Bacillus thuringiensis ; bioactive properties ; biological control ; biotechnology ; endotoxins ; lethal concentration 50 ; microbiology ; systematic review
    Language English
    Dates of publication 2020-09
    Size p. 128.
    Publishing place Springer Netherlands
    Document type Article
    Note NAL-AP-2-clean ; Review
    ZDB-ID 1499109-3
    ISSN 1573-0972 ; 0959-3993
    ISSN (online) 1573-0972
    ISSN 0959-3993
    DOI 10.1007/s11274-020-02904-4
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: Sugarcane inoculated with endophytic diazotrophic bacteria: effects on yield, biological nitrogen fixation and industrial characteristics.

    Antunes, Jadson Emanuel L / Freitas, Ana Dolores S DE / Oliveira, Louise M S / Lyra, Maria DO Carmo C P DE / Fonseca, Manoel A C / Santos, Carolina E R S / Oliveira, José DE Paula / Araújo, Ademir Sérgio F DE / Figueiredo, Márcia V B

    Anais da Academia Brasileira de Ciencias

    2019  Volume 91, Issue 4, Page(s) e20180990

    Abstract: The growing need for the use of clean energy has led society to seek alternatives to fossil fuels in order to less pollute the environment. Sugarcane has been known to produce enough biomass and to have associative microorganisms, such as plant growth- ... ...

    Abstract The growing need for the use of clean energy has led society to seek alternatives to fossil fuels in order to less pollute the environment. Sugarcane has been known to produce enough biomass and to have associative microorganisms, such as plant growth-promoting bacteria (PGPB), which have the potential to improve the yield of crops. The objective of this study is to evaluate the efficiency and the isotopic dilution of 15N of microbial inoculants containing endophytic diazotrophic bacteria, individually inoculated and in mixture, on productivity, technological quality and biological nitrogen fixation (BNF) of sugarcane variety RB92579. The experiment was conducted for three consecutive years, comprising different crop cycles, in a completely randomized block design with four replications. The evaluations were at 11 months after planting for plant-cane, and at 12 months after cutting for ratoon cane and second ratoon cane. The contribution of BNF by 15N natural abundance technique to inoculated treatments ranged from 18% to 57.31%. This study showed that no strain promoted the improvement on yield and biological nitrogen fixation during the three cycles of sugarcane (plant-cane, ratoon cane and second ratoon cane). However, industrial characteristics of sugar cane can be affectd by PGPB inoculation.
    MeSH term(s) Bacteria/metabolism ; Biomass ; Crops, Agricultural ; Endophytes ; Nitrogen/metabolism ; Nitrogen Fixation ; Saccharum/growth & development ; Saccharum/microbiology
    Chemical Substances Nitrogen (N762921K75)
    Language English
    Publishing date 2019-11-25
    Publishing country Brazil
    Document type Journal Article
    ZDB-ID 2046885-4
    ISSN 1678-2690 ; 0001-3765
    ISSN (online) 1678-2690
    ISSN 0001-3765
    DOI 10.1590/0001-3765201920180990
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Optimization of a culture medium based on forage palm for δ-endotoxin production

    da Silva, Túlio Alexandre Freire / Freitas, Lívia Santos de / da Silva, Larita Veruska José Bezerra / Duarte Neto, José Manoel Wanderley / da Silva, Gilvanda Ribeiro / Maranhão, Liane Maria de Almeida Castro / Coitinho, Rodrigo Leandro Braga de Castro / de Lacerda, Cynthia Araújo / Oliveira, José de Paula / Bezerra, Raquel Pedrosa / Porto, Ana Lúcia Figueiredo

    Biocatalysis and agricultural biotechnology. 2020 Aug., v. 27

    2020  

    Abstract: An alternative culture medium based on forage palm (Cactaceae) and inexpensive nitrogen sources for δ-endotoxin production by Bacillus thuringiensis var. berliner (Btb) was optimized using response surface methodology and the influence of the nitrogen ... ...

    Abstract An alternative culture medium based on forage palm (Cactaceae) and inexpensive nitrogen sources for δ-endotoxin production by Bacillus thuringiensis var. berliner (Btb) was optimized using response surface methodology and the influence of the nitrogen sources on biological activity and morphological properties of the δ-endotoxin has been studied. Effects of forage palm extract concentration (15–25%), ammonium sulphate (0–1 g/L), ammonium chloride (0–1 g/L) and urea concentrations (0–1 g/L) on δ-endotoxin production were studied by a 2⁴ full factorial design and optimized by a 2² central composite design (CCD). Statistical analysis showed that forage palm and ammonium sulphate were the main factors to enhance δ-endotoxin production. Different nitrogen sources influenced on biological activity and morphology of crystals. Culture medium constituted by forage palm extract and ammonium sulphate increased δ-endotoxins production in the form of bipyramidal crystals and was more toxic to Spodoptera frugiperda. Forage palm extract and ammonium sulphate were considered to optimization of δ-endotoxin production. Maximum δ-endotoxin production (356 mg/L) took place at 30.7% (w/v) of forage palm extract concentration and 1.016 g/L of ammonium sulphate.
    Keywords Bacillus thuringiensis subsp. berliner ; Cactaceae ; Spodoptera frugiperda ; ammonium chloride ; ammonium sulfate ; crystals ; culture media ; delta-endotoxins ; forage ; plant extracts ; response surface methodology ; statistical analysis ; toxicity ; urea
    Language English
    Dates of publication 2020-08
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2642052-1
    ISSN 1878-8181
    ISSN 1878-8181
    DOI 10.1016/j.bcab.2020.101664
    Database NAL-Catalogue (AGRICOLA)

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