1. Isolation of Bacillus thuringiensis serovar israelensis VCRC-B650 from Indian clay soil with enhanced mosquitocidal activity and dehairing property: Isolation of Bacillus thuringiensis serovar israelensis VCRC-B650: K. Gangmei et al.
- Author
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Gangmei, Kakhuangailiu, Lukose, Jibi, Vijayakumar, Abhisubesh, Padmanaban, Hemaladkshmi, Mandodan, Sahadiya, Bora, Bhagyashree, Sivaprakasam, Manikandan, Kunnikuruvan, Aneha, Ashokkumar, Mathivanan, Balakrishnan, Vijayakumar, Irudayaraj, Geetha, and Subbiah, Poopathi
- Abstract
The use of microbial agents is an environmentally friendly approach to mosquito control, wherein natural enemies of mosquitoes are employed to control mosquito populations. A novel mosquitocidal bacterium was isolated from clay soil from the Union Territory of Puducherry, India, and was identified as Bacillus thuringiensis serovar israelensis (Bti), de Barjac (VCRC-B650) (Bacillales: Bacillaceae) through whole genome sequencing (WGS), along with the amplification of cry (cry4A, cry4B, cry10, cry11), and cyt (cyt1, cyt2) genes. Bioassays conducted against mosquito larvae (Diptera: Culicidae) demonstrated varying degrees of susceptibility to Bti VCRC-B650, with the larvae of the dengue vector, Aedes aegypti (Linnaeus), exhibiting the highest susceptibility (LC
50 = 0.0049 and LC90 = 0.0084 mg l−1 ). The filarial vector, Culex quinquefasciatus (Say), showed moderate susceptibility (LC50 = 0.0054 and LC90 = 0.0094 mg l−1 ), while the malarial vector, Anopheles stephensi (Liston), displayed the lowest susceptibility (LC50 = 0.0104 and LC90 = 0.0215 mg l−1 ). Compared to the WHO standard strain Bti H-14, the Bti VCRC-B650 isolate was observed to be more efficient and has not exhibited adverse effects on non-target aquatic organisms. This study revealed that the new strain of Bti (VCRC-B650), can be employed in vector control with dual functions such as mosquitocidal activity and the ability to produce protease with dehairing property. [ABSTRACT FROM AUTHOR]- Published
- 2025
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