1
|
Cao SK, Du XX, Chen G, Zeng AP, Yu H. Relative activity of 15 bacterial strains against the larvae of Helicoverpa armigera, Spodoptera exigua, and Spodoptera litura (Lepidoptera: Noctuidae). JOURNAL OF ECONOMIC ENTOMOLOGY 2023; 116:1505-1517. [PMID: 37499044 DOI: 10.1093/jee/toad147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 06/08/2023] [Accepted: 07/11/2023] [Indexed: 07/29/2023]
Abstract
Crystal toxins produced by different strains of entomopathogenic Bacillus thuringiensis (Bt) have been characterized and widely applied as commercial biological pesticides owing to their excellent insecticidal properties. This study aimed to identify novel bacterial strains effective in controlling Spodoptera exigua Hübner, Helicoverpa armigera Hübner, and Spodoptera litura Fabricius. Fifteen culturable bacterial strains were isolated from 60 dead larvae (H. armigera and S. exigua) collected in the field. The biochemical characteristics and 16S rRNA sequences of these strains indicated that one strain (B7) was Lysinibacillus sp., 12 strains (B1, B3, B4, B5, B6, B8, P2, P3, P4, P5, P6, and DW) were Bt kurstaki, and P2-2 and B2 were Bacillus velezensis subsp. Laboratory bioassays indicated that strains B3, P6, B6, and P4 showed high toxicity to second-instar larvae of S. exigua, with LC50 values of 5.11, 6.74, 205.82, and 595.93 µg/ml, respectively; while the strains P5, B5, B6, and P6, were the most efficient against second-instar larvae of H. armigera with LC50 values of 725.82, 11,022.72, 1,282.90, 2,005.28, respectively, and strains DW, P3, P2, and B4 had high insecticidal activity against second-instar larvae of S. litura with LC50 values of 576.69, 1,660.96, 6,309.42, and 5,486.10 µg/ml, respectively. In conclusion, several Bt kurstaki strains with good toxicity potential were isolated and identified in this study. These strains are expected to be useful for biointensive integrated pest management programs to reduce the use of synthetic insecticides.
Collapse
Affiliation(s)
- Sheng-Kai Cao
- Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, Hunan Agricultural University, Changsha, Hunan 410128, China
- College of Plant Protection, Hunan Agricultural University, Changsha, Hunan 410128, China
| | - Xing-Xing Du
- Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, Hunan Agricultural University, Changsha, Hunan 410128, China
- College of Plant Protection, Hunan Agricultural University, Changsha, Hunan 410128, China
| | - Gong Chen
- Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, Hunan Agricultural University, Changsha, Hunan 410128, China
- College of Plant Protection, Hunan Agricultural University, Changsha, Hunan 410128, China
| | - Ai-Ping Zeng
- Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, Hunan Agricultural University, Changsha, Hunan 410128, China
- College of Plant Protection, Hunan Agricultural University, Changsha, Hunan 410128, China
| | - Huan Yu
- Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, Hunan Agricultural University, Changsha, Hunan 410128, China
- College of Plant Protection, Hunan Agricultural University, Changsha, Hunan 410128, China
| |
Collapse
|
2
|
Oliveira-Santos N, Pimentel Rodrigues Dos Santos LB, Fernandes JV, Cruz-Magalhães V, Loguercio LL. More than just an insect killer: The non-insecticidal activities of Bacillus thuringiensis with biotechnological potential. Toxicon 2023; 233:107261. [PMID: 37611671 DOI: 10.1016/j.toxicon.2023.107261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 08/17/2023] [Accepted: 08/19/2023] [Indexed: 08/25/2023]
Abstract
Bacillus thuringiensis (Bt) is known for the biological control of important insect pests, but scientific advances have revealed several interesting characteristics, in addition to this classical function as a bioinsecticide. To investigate the current knowledge about these non-insecticidal activities, a systematic research on primary data in the scientific literature was conducted on alternative functions of Bt with biotechnological potential. Out of a total of 140 articles selected, 15 non-insecticidal Bt activities were found. Publications related to this topic are available since 1971, and different metadata were reported, such as biomolecules and genes involved in Bt performances in non-insecticidal bioactivities. A total of 11 Bt activities with different effect measures (response variables) were identified, with an average of 48 distinct Bt strains evaluated per activity. Approximately 81.2% of all identified experiments/tests deal with the direct effects of Bt on target cells/organisms, with 36.3% of the strains within these studies tested for antibacterial action; of all microbial targets tested, 92.8% are bacteria, which led to 75.2% of the experimental conditions for all direct activities being performed in vitro. Regarding indirect Bt activities, 67.6% of these studies reported tritrophic Bt-plant-pathogen interactions. Bioremediation also appears as a relevant Bt activity being investigated in-depth. Alternative Bt activities offer innovative ways of developing biotechnology for different areas of anthropic interest; hence, we also focus on the possibility of finding multifunctional strains of Bt, as this may be advantageous from a bioeconomic point of view. Our findings are discussed in terms of research trends, aspects, details and depth of the current knowledge on alternative non-insecticidal Bt traits. We also discuss the potential application of this science for useful technological developments, aiming at solving issues related to human health, sustainable agriculture and environmental preservation/restoration.
Collapse
Affiliation(s)
- Naiane Oliveira-Santos
- Department of Biological Sciences, State University of Santa Cruz (UESC), Rod, Ilhéus-Itabuna, Km-16, Ilhéus, BA, 45662-900, Brazil.
| | | | - Jacquelline Viana Fernandes
- Department of Biological Sciences, State University of Santa Cruz (UESC), Rod, Ilhéus-Itabuna, Km-16, Ilhéus, BA, 45662-900, Brazil.
| | - Valter Cruz-Magalhães
- Department of Biological Sciences, State University of Santa Cruz (UESC), Rod, Ilhéus-Itabuna, Km-16, Ilhéus, BA, 45662-900, Brazil; Department of Phytophatology (DFP), Federal University of Lavras (UFLA), Lavras, MG, Brazil.
| | - Leandro Lopes Loguercio
- Department of Biological Sciences, State University of Santa Cruz (UESC), Rod, Ilhéus-Itabuna, Km-16, Ilhéus, BA, 45662-900, Brazil.
| |
Collapse
|
3
|
Pérez-Rangel M, Valdez-Vazquez I, Martínez-Zavala SA, Casados-Vázquez LE, Bideshi DK, Barboza-Corona JE. Evaluation of inhibitory compounds produced by bacteria isolated from a hydrogen-producing bioreactor during the self-fermentation of wheat straw. J Appl Microbiol 2022; 133:1989-2001. [PMID: 35808847 DOI: 10.1111/jam.15708] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 06/29/2022] [Accepted: 07/05/2022] [Indexed: 11/28/2022]
Abstract
AIMS The objective of this study was to evaluate the inhibitory activity of compounds secreted by bacteria isolated from a hydrogen-producing bioreactor to understand how these microorganisms interact in this community. METHODS AND RESULTS In vitro inhibitory assays were performed using samples secreted by bacteria subject to different treatments to determine if their inhibitory effect was due to organic acids, non-proteinaceous compounds, or bacteriocin-like inhibitory substances (BLIS). Bacterial isolated were suppressed 43%, 30%, and 27% by neutralized, precipitated, and non-neutralized cell-free supernatants, respectively. Non-hydrogen producers (Non-H2 P) LAB (Lactobacillus plantarum LB1, L. pentosus LB7, Pediococcus acidilactici LB4) and hydrogen producers (H2 P) LAB (Enterococcus faecium F) were inhibited by the production of organic acids, non-proteinaceous compounds, and BLIS. Meanwhile, the obligate anaerobe H2 P (Clostridium beijerinckii B) inhibited by the production of non-proteinaceous compounds and BLIS. The presence of BLIS was confirmed when proteolytic enzymes affected the inhibitory activity of secreted proteins in values ranging from 20 to 42%. The BLIS produced by L. plantarum LB1, P. acidilactici LB4, L. pentosus LB7, and E. faecium F showed molecular masses of ~ 11 kDa, 25 kDa, 20 kDa, and 11 kDa, respectively. CONCLUSIONS It was demonstrated antagonistic interactions between Lactobacillus- Enterococcus, and Pediococcus-Enterococcus species, generated by the secretion of organic acids, non-proteinaceous compounds, and BLIS. SIGNIFICANCE AND IMPACT OF THE STUDY We report the interactions between LAB isolated from hydrogen-producing bioreactors. These interactions might impact the dynamics of the microbial population during hydrogen generation. Our work lays a foundation for strategies that allow controlling bacteria that can affect hydrogen production.
Collapse
Affiliation(s)
- Marisol Pérez-Rangel
- Graduate Program in Biosciences, Life Science Division, University of Guanajuato Campus Irapuato-Salamanca. Irapuato, Guanajuato, México.,Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Querétaro, Mexico
| | - Idania Valdez-Vazquez
- Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Querétaro, Mexico
| | - Sheila A Martínez-Zavala
- Graduate Program in Biosciences, Life Science Division, University of Guanajuato Campus Irapuato-Salamanca. Irapuato, Guanajuato, México
| | - Luz E Casados-Vázquez
- Graduate Program in Biosciences, Life Science Division, University of Guanajuato Campus Irapuato-Salamanca. Irapuato, Guanajuato, México.,Food Department, Life Science División, University of Guanajuato Campus Irapuato-Salamanca. Irapuato, Guanajuato, México.,CONACyT-University of Guanajuato
| | - Dennis K Bideshi
- Department of Biological Sciences, California Baptist University, Riverside, California, USA
| | - José E Barboza-Corona
- Graduate Program in Biosciences, Life Science Division, University of Guanajuato Campus Irapuato-Salamanca. Irapuato, Guanajuato, México.,Food Department, Life Science División, University of Guanajuato Campus Irapuato-Salamanca. Irapuato, Guanajuato, México
| |
Collapse
|
4
|
Ortiz-Rodríguez T, Mendoza-Acosta F, Martínez-Zavala SA, Salcedo-Hernández R, Casados-Vázquez LE, Bideshi DK, Barboza-Corona JE. Thurincin H Is a Nonhemolytic Bacteriocin of Bacillus thuringiensis with Potential for Applied Use. Probiotics Antimicrob Proteins 2022:10.1007/s12602-022-09952-2. [PMID: 35610496 DOI: 10.1007/s12602-022-09952-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/10/2022] [Indexed: 11/24/2022]
Abstract
Thurincin H, a bacteriocin produced by Bacillus thuringiensis, exhibits antibacterial activity against Gram-positive and Gram-negative bacteria. While much is known about its expression and antimicrobial spectrum, its hemolytic property has yet to be established. In this study, thurincin H was produced in a plasmid-free acrystalliferous strain of B. thuringiensis (Bt Cry-B) that naturally lacked antimicrobial and hemolytic activities. When grown in Tryptic Soy Broth (TSB), the bacteriocin's maximal production in Bt Cry-B harboring the thurincin H genetic cluster (Bt Cry-B/pThur) was observed at 24 h. Thurincin H was purified as a sole peptide of ~5 kDa using three purification steps, i.e., salt precipitation, ultrafiltration, and gel filtration chromatography. The bacteriocin showed inhibitory activity against B. cereus (5631 U), Bt Cry-B (8827 U), E. faecium wild type (11,197 U), and E. faecium ATCC 19,434 (6950 U), but not against Bt Cry-B/pThurH and Bt Cry-B/pThurHΔThnA. In addition, a minimum inhibitory concentration (MIC) of 5.0 μg/mL against B. cereus 183 was observed. In silico predictions suggested that thuricin H lacks hemolytic activity, which was validated in vitro using 4 × the MIC, i.e., 20 μg/ml. Our data lay a foundation for the potential safe use of thurincin H as an antibacterial peptide for medical use, in food products, and for expression in probiotic bacteria.
Collapse
Affiliation(s)
- Tomás Ortiz-Rodríguez
- Posgrado en Biociencias, Universidad de Guanajuato Campus Irapuato-Salamanca, División de Ciencias de la Vida, Irapuato, Guanajuato, 36500, México
| | - Fernanda Mendoza-Acosta
- Posgrado en Biociencias, Universidad de Guanajuato Campus Irapuato-Salamanca, División de Ciencias de la Vida, Irapuato, Guanajuato, 36500, México
| | - Sheila A Martínez-Zavala
- Posgrado en Biociencias, Universidad de Guanajuato Campus Irapuato-Salamanca, División de Ciencias de la Vida, Irapuato, Guanajuato, 36500, México
| | - Rubén Salcedo-Hernández
- Posgrado en Biociencias, Universidad de Guanajuato Campus Irapuato-Salamanca, División de Ciencias de la Vida, Irapuato, Guanajuato, 36500, México.,Departamento de Alimentos, Universidad de Guanajuato Campus Irapuato-Salamanca, División de Ciencias de la Vida, Irapuato, Guanajuato, 36500, México
| | - Luz E Casados-Vázquez
- Posgrado en Biociencias, Universidad de Guanajuato Campus Irapuato-Salamanca, División de Ciencias de la Vida, Irapuato, Guanajuato, 36500, México.,Departamento de Alimentos, Universidad de Guanajuato Campus Irapuato-Salamanca, División de Ciencias de la Vida, Irapuato, Guanajuato, 36500, México.,CONACYT- Universidad de Guanajuato, Campus Irapuato-Salamanca, Irapuato, Guanajuato, 36500, México
| | - Dennis K Bideshi
- Department of Biological Sciences, California Baptist University, 8432 Magnolia Avenue, Riverside, CA, 92504, USA
| | - José E Barboza-Corona
- Posgrado en Biociencias, Universidad de Guanajuato Campus Irapuato-Salamanca, División de Ciencias de la Vida, Irapuato, Guanajuato, 36500, México. .,Departamento de Alimentos, Universidad de Guanajuato Campus Irapuato-Salamanca, División de Ciencias de la Vida, Irapuato, Guanajuato, 36500, México.
| |
Collapse
|