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Ma X, Hu J, Ding C, Portieles R, Xu H, Gao J, Du L, Gao X, Yue Q, Zhao L, Borrás-Hidalgo O. New native Bacillus thuringiensis strains induce high insecticidal action against Culex pipiens pallens larvae and adults. BMC Microbiol 2023; 23:100. [PMID: 37055727 PMCID: PMC10099900 DOI: 10.1186/s12866-023-02842-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Accepted: 03/28/2023] [Indexed: 04/15/2023] Open
Abstract
Mosquitoes of many species are key disease vectors, killing millions of people each year. Bacillus thuringiensis-based insecticide formulations are largely recognized as among the most effective, ecologically safe, and long-lasting methods of managing insect pests. New B. thuringiensis strains with high mosquito control effectiveness were isolated, identified, genetically defined, and physiologically characterized. Eight B. thuringiensis strains were identified and shown to carry endotoxin-producing genes. Using a scanning electron microscope, results revealed typical crystal forms of various shapes in B. thuringiensis strains. Fourteen cry and cyt genes were found in the strains examined. Although the genome of the B. thuringiensis A4 strain had twelve cry and cyt genes, not all of them were expressed, and only a few protein profiles were observed. The larvicidal activity of the eight B. thuringiensis strains was found to be positive (LC50: 1.4-28.5 g/ml and LC95: 15.3-130.3 g/ml). Bioassays in a laboratory environment demonstrated that preparations containing B. thuringiensis spores and crystals were particularly active to mosquito larvae and adults. These new findings show that the novel preparation containing B. thuringiensis A4 spores and crystals mixture might be used to control larval and adult mosquitoes in a sustainable and ecologically friendly manner.
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Affiliation(s)
- Xinmin Ma
- Joint R and D Center of Biotechnology, RETDA, Yotabio-Engineering Co., Ltd, 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China
| | - Jianjian Hu
- Joint R and D Center of Biotechnology, RETDA, Yotabio-Engineering Co., Ltd, 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China
| | - Chengsong Ding
- Joint R and D Center of Biotechnology, RETDA, Yotabio-Engineering Co., Ltd, 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China
| | - Roxana Portieles
- Joint R and D Center of Biotechnology, RETDA, Yotabio-Engineering Co., Ltd, 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China
| | - Hongli Xu
- Joint R and D Center of Biotechnology, RETDA, Yotabio-Engineering Co., Ltd, 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China
| | - Jingyao Gao
- Joint R and D Center of Biotechnology, RETDA, Yotabio-Engineering Co., Ltd, 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China
| | - Lihua Du
- Joint R and D Center of Biotechnology, RETDA, Yotabio-Engineering Co., Ltd, 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China
| | - Xiangyou Gao
- Joint R and D Center of Biotechnology, RETDA, Yotabio-Engineering Co., Ltd, 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China
| | - Qiulin Yue
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab of Microbial Engineering, Qilu University of Technology (Shandong Academic of Science), Jinan, People's Republic of China
| | - Lin Zhao
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab of Microbial Engineering, Qilu University of Technology (Shandong Academic of Science), Jinan, People's Republic of China
| | - Orlando Borrás-Hidalgo
- Joint R and D Center of Biotechnology, RETDA, Yotabio-Engineering Co., Ltd, 99 Shenzhen Road, Rizhao, 276826, Shandong, People's Republic of China.
- State Key Laboratory of Biobased Material and Green Papermaking, Shandong Provincial Key Lab of Microbial Engineering, Qilu University of Technology (Shandong Academic of Science), Jinan, People's Republic of China.
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Faheem A, Qin Y, Nan W, Hu Y. Advances in the Immunoassays for Detection of Bacillus thuringiensis Crystalline Toxins. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:10407-10418. [PMID: 34319733 DOI: 10.1021/acs.jafc.1c02195] [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] [Indexed: 06/13/2023]
Abstract
Insect-resistant genetically modified organisms have been globally commercialized for the last 2 decades. Among them, transgenic crops based on Bacillus thuringiensis crystalline (Cry) toxins are extensively used for commercial agricultural applications. However, less emphasis is laid on quantifying Cry toxins because there might be unforeseen health and environmental concerns. Immunoassays, being the preferred method for detection of Cry toxins, are reviewed in this study. Owing to limitations of traditional colorimetric enzyme-linked immunosorbent assay, the trend of detection strategies shifts to modified immunoassays based on nanomaterials, which provide ultrasensitive detection capacity. This review assessed and compared the properties of the recent advances in immunoassays, including colorimetric, fluorescence, chemiluminescence, surface-enhanced Raman scattering, surface plasmon resonance, and electrochemical approaches. Thus, the ultimate aim of this study is to identify research gaps and infer future prospects of current approaches for the development of novel immunosensors to monitor Cry toxins in food and the environment.
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Affiliation(s)
- Aroosha Faheem
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, Hubei 430070, People's Republic of China
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, People's Republic of China
| | - Yuqing Qin
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, Hubei 430070, People's Republic of China
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, People's Republic of China
| | - Wenrui Nan
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, Hubei 430070, People's Republic of China
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, People's Republic of China
| | - Yonggang Hu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, Hubei 430070, People's Republic of China
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, People's Republic of China
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Potential for Bacillus thuringiensis and Other Bacterial Toxins as Biological Control Agents to Combat Dipteran Pests of Medical and Agronomic Importance. Toxins (Basel) 2020; 12:toxins12120773. [PMID: 33291447 PMCID: PMC7762171 DOI: 10.3390/toxins12120773] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2020] [Revised: 11/24/2020] [Accepted: 12/03/2020] [Indexed: 11/16/2022] Open
Abstract
The control of dipteran pests is highly relevant to humans due to their involvement in the transmission of serious diseases including malaria, dengue fever, Chikungunya, yellow fever, zika, and filariasis; as well as their agronomic impact on numerous crops. Many bacteria are able to produce proteins that are active against insect species. These bacteria include Bacillus thuringiensis, the most widely-studied pesticidal bacterium, which synthesizes proteins that accumulate in crystals with insecticidal properties and which has been widely used in the biological control of insects from different orders, including Lepidoptera, Coleoptera, and Diptera. In this review, we summarize all the bacterial proteins, from B. thuringiensis and other entomopathogenic bacteria, which have described insecticidal activity against dipteran pests, including species of medical and agronomic importance.
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