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Abu El-Ghiet UM, Moustafa SA, Ayashi MM, El-Sakhawy MA, Ateya AAES, Waggiallah HA. Characterization of Bacillus thuringiensis isolated from soils in the Jazan region of Saudi Arabia, and their efficacy against Spodoptera littoralis and Aedes aegypti larvae. Saudi J Biol Sci 2023; 30:103721. [PMID: 37457233 PMCID: PMC10344810 DOI: 10.1016/j.sjbs.2023.103721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 06/18/2023] [Accepted: 06/23/2023] [Indexed: 07/18/2023] Open
Abstract
Pest control in Saudi Arabia depends on applying chemical insecticides, which have many undesirable considerations and impacts on the environment. Therefore, the aim of this study was to isolate Bacillus thuringiensis from different rhizosphere soil samples in the Jazan region for the biological control of Spodoptera littoralis and Aedes aegypti larvae. The samples were collected from the rhizosphere of different plants located in eight agricultural areas in Jazan, Saudi Arabia. Out of 100 bacterial isolates, four bacterial isolates belonging to Bacillus species were selected namely JZ1, JZ2, JZ3, and JZ4, and identified using classical bacteriological and molecular identification using 16S rRNA. JZ1 and JZ2 isolates were identified as Bacillus thuringiensis. SDS-PAGE analysis and the detection of the Cry1 gene were used to describe the two isolates JZ1 and JZ2 in comparison to Bacillus thuringiensis reference strain Kurstaki HD1 (BTSK) were revealed that slightly different from each other due to the place of their isolation and namely Khlab JZ1 and Ayash JZ2. The EC50 of JZ1 and JZ2 isolates, BTSK, and the commercial biopesticide DiPEL 6.4 DF against the second-instar larvae of Aedes aegypti were 207, 932, 400, and 500 ppm respectively, while EC50 against first-instar larvae of Spodoptera littoralis were 193.93, 589.7, 265.108, and 342.9, ppm respectively. Isolate JZ1 recorded the highest mortality while JZ2 isolate gave the lowest mortality. It can be concluded that the local isolate of JZ1 and JZ2 can be developed for bio formulations to be used in Spodoptera littoralis and Aedes aegypti biological control programs.
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Affiliation(s)
| | - Salah A. Moustafa
- Biology Department, Faculty of Science, Jazan University, Saudi Arabia
- Agriculture Genetic Engineering Research Institute (AGERI), Agricultural Research Center (ARC), Giza 12619, Egypt
| | - Mousa M. Ayashi
- Biology Department, Faculty of Science, Jazan University, Saudi Arabia
| | - Mohamed A. El-Sakhawy
- Department of Medical Laboratory Sciences, College of Applied Medical Sciences, Prince Sattam bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
- Department of Medicinal and Aromatic Plants, Desert Research Center, Cairo, Egypt
| | - Abeer Ali El-Sherbiny Ateya
- Department of Medical Laboratory Sciences, College of Applied Medical Sciences, Prince Sattam bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
| | - Hisham Ali Waggiallah
- Department of Medical Laboratory Sciences, College of Applied Medical Sciences, Prince Sattam bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
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Characterization of insecticidal Cry protein from Bacillus thuringiensis toxic to Myzus persicae (Sulzer). J Invertebr Pathol 2022; 189:107731. [PMID: 35202622 DOI: 10.1016/j.jip.2022.107731] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 01/27/2022] [Accepted: 02/14/2022] [Indexed: 11/20/2022]
Abstract
The toxins produced by Bacillus thuringiensis (Bt) are well known for their insecticidal activity against Lepidoptera, Diptera and Coleoptera; however, the sap-sucking insects (Hemiptera) are not particularly susceptible to Bt toxins. We describe the aphicidal effect of Cry toxin from Bt strain GP919 against one of the most pernicious hemipterans in the agricultural environment, Myzus persicae. The mortality bioassay shows that the strain cause mortality rates above 80% at concentration of 10 ng/µl with a LC50 of 9.01 ng/µl; whereas it showed no lethal toxicity against the lepidopteran Spodoptera frugiperda. The mayor protein (∼130 kDa) expressed by this strain was subjected to purification, solubilization and trypsin digestion, the band of ∼65 kDa which was obtained from trypsin digestion was purified by ion-exchange chromatography and was used to feed the aphid. The bioassay shows mortality rates above 85% at concentration of 10 ng/µl and the LC50 was 6.58 ng/µl. The resulting fragment from the digestion was identified by mass spectrometry and the candidate protein showed an overall 100% amino acid sequence identity to the reported Cry1Cb2 (WP 033698561.1) protein from Bt. Koch's postulated also was carried out with the GP919 strain and also, we document the signs of infection caused by this strain. This is the first report of a Cry1Cb2 protein that is toxic to a sucking insect and this protein may become a promising environmentally friendly tool for the control of M. persicae and possible also for other sap sucking insect pests.
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Baranek J, Banaszak M, Kaznowski A, Lorent D. A novel Bacillus thuringiensis Cry9Ea-like protein with high insecticidal activity towards Cydia pomonella larvae. PEST MANAGEMENT SCIENCE 2021; 77:1401-1408. [PMID: 33099864 DOI: 10.1002/ps.6157] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 10/23/2020] [Accepted: 10/25/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND The host specificity of known Bacillus thuringiensis Cry and Vip pesticidal proteins still needs extensive investigation and the proteins currently used in crop protection are not effective against many pest species. Cydia pomonella (L.) is a widespread and economically important pest of apples, very difficult to control, since the larvae spend most of their life inside a fruit. Currently, large amounts of broad-spectrum, detrimental synthetic agents are used to combat this herbivore and therefore biopesticides with high activity against C. pomonella are very much needed. RESULTS The toxicity of B. thuringiensis Cry9Ea along with five distinct pesticidal proteins (Cry1Aa, Cry1Ca, Cry1Ia, Cry2Ab and Vip3Aa) has been determined towards the first-instar larvae of C. pomonella. Cry9Ea has much higher activity than the remaining tested proteins (30-1200-fold lower LC50 ) and possibly is the most potent B. thuringiensis pesticidal protein bioassayed against C. pomonella so far. In contrast, Cry9Ea is not toxic towards Spodoptera exigua (Hübn.), indicating a potentially narrow spectrum of activity. Both insect species show high variability in susceptibility to the remaining Cry/Vip proteins. CONCLUSIONS The obtained results extend the existing knowledge regarding B. thuringiensis pesticidal protein host range and indicate Cry9Ea as a promising candidate for successful biological control of C. pomonella. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Jakub Baranek
- Department of Microbiology, Faculty of Biology, Adam Mickiewicz University in Poznań, Poznań, Poland
| | - Magdalena Banaszak
- Department of Microbiology, Faculty of Biology, Adam Mickiewicz University in Poznań, Poznań, Poland
| | - Adam Kaznowski
- Department of Microbiology, Faculty of Biology, Adam Mickiewicz University in Poznań, Poznań, Poland
| | - Dagny Lorent
- Department of Microbiology, Faculty of Biology, Adam Mickiewicz University in Poznań, Poznań, Poland
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BenFarhat-Touzri D, Jemli S, Driss F, Tounsi S. Molecular and structural characterization of a novel Cry1D toxin from Bacillus thuringiensis with high toxicity to Spodoptera littoralis (Lepidoptera: Noctuidae). Int J Biol Macromol 2019; 126:969-976. [PMID: 30593807 DOI: 10.1016/j.ijbiomac.2018.12.175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 12/08/2018] [Accepted: 12/19/2018] [Indexed: 10/27/2022]
Abstract
The investigation of new Bacillus thuringiensis (Bt) insecticidal proteins (Cry) with specific toxicity is one of the alternative measures used for Lepidopteran pest control. In the present study, a new Cry toxin was identified from a promising Bt strain BLB250 which was previously selected for its high toxicity against Spodoptera littoralis. The corresponding gene, designated cry1D-250, was cloned. It showed an ORF of 3498bp, encoding a protein of 1165 amino acid residues with a putative molecular mass of 132kDa which was confirmed by SDS-PAGE and Western blot analyses. The corresponding toxin named Cry1D-250 showed a higher insecticidal activity towards S. littoralis than Cry1D-133 (LC50 of 224.4ngcm-2) with an LC50 of only 166ngcm-2. Besides to the 65kDa active toxin, proteolysis activation of Cry1D-133 protein with S. littoralis midgut juice generated an extra form of 56kDa, which was the result of a second cleavage. Via activation study and 3D structure analysis, novel substitutions found in the Cry1D-250 protein compared to Cry1D-133 toxin were shown to be involved in the protein stability and toxicity. Therefore, the Cry1D-250 toxin can be considered to be an effective alternative for the control of S. littoralis.
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Affiliation(s)
- Dalel BenFarhat-Touzri
- Laboratory of Biopesticides, Centre of Biotechnology of Sfax, University of Sfax, P.O. Box. "1177", 3018 Sfax, Tunisia
| | - Sonia Jemli
- Laboratory of Microbial Biotechnology and Enzyme Engineering, Centre of Biotechnology of Sfax, University of Sfax, P.O. Box. "1177", 3018 Sfax, Tunisia
| | - Fatma Driss
- Laboratory of Biopesticides, Centre of Biotechnology of Sfax, University of Sfax, P.O. Box. "1177", 3018 Sfax, Tunisia.
| | - Slim Tounsi
- Laboratory of Biopesticides, Centre of Biotechnology of Sfax, University of Sfax, P.O. Box. "1177", 3018 Sfax, Tunisia
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Konecka E, Baranek J, Hrycak A, Kaznowski A. Insecticidal activity of Bacillus thuringiensis strains isolated from soil and water. ScientificWorldJournal 2012; 2012:710501. [PMID: 22666145 PMCID: PMC3361314 DOI: 10.1100/2012/710501] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Accepted: 11/24/2011] [Indexed: 11/17/2022] Open
Abstract
We attempted to search novel Bacillus thuringiensis strains that produce crystals with potential utility in plant protection and with higher activity than strains already used in biopesticide production. Seven B. thuringiensis soil and water isolates were used in the research. We predicted the toxicity of their crystals by cry gene identification employing PCR method. The isolate MPU B63 with interesting, according to us, genes content was used in evaluating its crystal toxicity against Cydia pomonella caterpillars. The strain MPU B63 was cultured from water sample and had cry1Ab, cry1B, and cry15 genes. The LC50 crystals of MPU B63 were compared to LC50 of commercial bioinsecticide Foray determined against C. pomonella (codling moth). The activity of MPU B63 inclusions against codling moth larvae was approximately 24-fold higher than that of Foray. The results are a promising introduction for further study evaluating the potential usefulness of isolate MPU B63 crystals in plant protection.
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Affiliation(s)
- Edyta Konecka
- Department of Microbiology, Faculty of Biology, Adam Mickiewicz University, Umultowska 89, 61-614 Poznań, Poland.
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Improving Formulations for Biopesticides: Enhanced UV Protection for Beneficial Microbes. ACTA ACUST UNITED AC 2011. [DOI: 10.1520/jai102793] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Biochemical and molecular characterization of delta-endotoxins in Bacillus thuringiensis. Folia Microbiol (Praha) 2010; 54:487-92. [PMID: 20140714 DOI: 10.1007/s12223-009-0069-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2009] [Revised: 06/01/2009] [Indexed: 10/19/2022]
Abstract
The delta-endotoxins (delta-ETX) of four native strains (RT7, RT19, RT25, and RT25), and one reference strain (4L1) of Bacillus thuringiensis were biochemically and molecularly characterized to determine their potential toxic activity against lepidopteran larvae. Crystals of delta-ETX were purified through a two-phase system to determine their morphology, molar mass, solubility, and resistance to proteinases. Toxic activity and cry gene content were also determined. Crystals from native strains exhibited polyhedral, irregular and cuboidal shapes, while those from 4L1 were bipyramidal. Seven proteins with estimated molar mass approximately 30-134 kDa were detected as the main components of the native delta-ETX. Only crystals from 4L1, RT24, and RT25 underwent complete solubilization at pH >12.0. Crystals from all strains produced trypsin-resistant peptides. None of the cry genes associated with toxicity in lepidopterans (cry1, cry2, cry9) was found in the native strains; however, 4L1 strain harbors cry1 and cry2 genes. Strains RT19 and RT25 caused significant mortality against Trichoplusia ni larvae with partial solubilization at pH 10, strain 4L1 caused 100 % mortality. Toxicity of native strains may come from a novel cry gene.
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Ammons DR, Reyna A, Granados JC, Samlal MS, Rampersad JN. An investigation of bacillus thuringiensis in rectal-collected fecal samples of cows. Curr Microbiol 2009; 59:532-6. [PMID: 19688377 DOI: 10.1007/s00284-009-9472-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2009] [Revised: 05/31/2009] [Accepted: 07/21/2009] [Indexed: 11/24/2022]
Abstract
In order to better understand the range and role of Bacillus thuringiensis (Bt) and its toxins in nature, we have undertaken a study of Bt taken directly from the rectum of 117 cows from 37 farms on the Caribbean island of Trinidad. Thirty-seven fecal samples (32%) were found to contain at least one Bt. Generally only one or two isolates with a particular crystal morphology were isolated from any one sample, however, a few samples contained more, up to 11 isolates, suggesting post-ingestion amplification. Bioassays using larvae of Musca domestica, Caenorhabditis elegans and Tetrahymena pyriformis showed no observable toxicity in gross bioassays. Very small dot-like parasporal bodies, not generally characteristic of Bt, were isolated from 44% of the samples, which in many instances appeared unstable and whose relation to Bt Cry protein-containing parasporal bodies is unknown. In conclusion, we find little evidence for a host adapted strain of Bt in the cows examined, nor toxicity to organisms that might logically be associated with either the cow or its feces. The presence of a large number of isolates containing small dot-like parasporal bodies, possibly either poly-beta-hydroxybutyrate storage bodies or Cry proteins, was unexpected and merits further investigation.
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Affiliation(s)
- David R Ammons
- Department of Chemistry, The University of Texas-Pan American, 1201 W. University Drive, Edinburg, TX 78539, USA.
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