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Journal of Arthropod-Borne Diseases، جلد ۱۹، شماره ۳، صفحات ۱۸۶۷-۱۸۶۷
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عنوان انگلیسی Exploitation of Endemic Extremophilic Microbial Strains Isolated from Date Palm Fibrillium in the Saoura Region (Southwest Algeria) as Potential Biocontrol Agents against Mosquitoes
چکیده انگلیسی مقاله Background: Algeria’s extreme ecosystems, such as the Saoura region, represent unique reservoirs of rare microor­ganisms, inhabiting pristine and unexplored virgin territories with considerable biotechnological potential. Chi­tinolytic bacteria are particularly noteworthy for mosquito control due to their ability to degrade chitin, the major structural com­ponent of the insect cuticle. This study aims to: (i) identify new microbial strains adapted to extreme desert conditions, overcoming the limited efficacy of some bioinsecticides, (ii) address the spread of vector-borne diseases and mosquito resistance, (iii) reduce the environmental impacts of non-selective insecticides, and (iv) ex­plore eco-friendly strategies and integrated biological control. Methods: Shrimp chitin was extracted to prepare selective media for the isolation and purification of chitinolytic bacte­ria. The entomopathogenic activity of these chitinolytic strains at concentrations of 10⁴, 10⁵ and 10⁶ CFU/mL was eval­uated through bioassays on Culex pipiens larvae. Results: We isolated three chitinolytic strains from Phoenix dactylifera bark, among which Streptomyces spp. 2 (STR2) was clearly the most virulent against Cx. pipiens larvae. This strain exhibited marked dose and time-dependent toxicity (LC50-LC99: 7.9×10³-3.4×10⁷ CFU/mL; DC: 6.8×10⁷ CFU/mL; LT50: 4.6 days). Beyond larval mortality, it also severely affected adults by reducing the proportion of flight-capable mosquitoes and increasing rates of flightlessness, post-emergence mortality, and deformity. However, an IGR-like mode of action remains speculative. Conclusion: This study confirms the larvicidal activity of desert-adapted chitinolytic bacteria, but further research is needed to determine their selectivity toward non-target organisms before considering their application in mosquito man­agement.
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نویسندگان مقاله | Boulanouar Ali
Laboratory of Biological Resources Valorization and Food Safety (BRVFS), Faculty of Natural and Life Sciences, Tahri Mohamed University of Bechar, Béchar, Algeria


| Larbi Benlarbi
Laboratory of Biological Resources Valorization and Food Safety (BRVFS), Faculty of Natural and Life Sciences, Tahri Mohamed University of Bechar, Béchar, Algeria


| Zineb Hamani
Laboratory of Biological Resources Valorization and Food Safety (BRVFS), Faculty of Natural and Life Sciences, Tahri Mohamed University of Bechar, Béchar, Algeria
نشانی اینترنتی https://jad.tums.ac.ir/index.php/jad/article/view/1867
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