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Evaluation of Cuban Bacillus thuringiensis(Berliner,1911)(Bacillales:Bacillacea)isolates with larvicidal activity against Aedes aegypti(Linnaeus,1762)(Diptera:Culicidae)

引用

Asian Pacific Journal of Tropical Medicine 2022年第2期15卷 79-86页

作者： Aileen Gonzalez Rizo Camilo E Castañet Martinez Celeste Ramírez Cardentey Ariamys Companioni Ibañez Zulema Menéndez Díaz Lianet Monzote Fidalgo Hilda M HernandezÁlvarez Vector Control Department Institute of Tropical MedicinePedro KouríAutopistaNovia del Mediodía km 6½La Habana 11400Cuba Virology Department Institute of Tropical MedicinePedro KouríAutopista Novia del Mediodía km 6½La Habana 11400Cuba Parasitology Department Institute of Tropical MedicinePedro KouríAutopista Novia del Mediodía km 6½La Habana 11400Cuba

Objective:To evaluate 11 Cuban native Bacillus(B.)thuringiensis isolates in order to select one with the best larvicidal activity against Aedes(Ae.)aegypti and low ***:The cry and cyt genes of the isolates(A21,A51,L95,L910,M29,R84,R85,R87,R89,U81 and X48)were amplified by *** influence of organic matter and NaCl on the larvicidal activity was tested by *** was assayed on peritoneal macrophages of BALB/c ***:The cyt1(Aa,Ab,Ba),cyt2,cry4aA,cry4Ba,cry11(Aa,Ba,Bb)and cry10 genes were identified in all native Cuban *** larvicidal activity(LC_(90))of seven isolates was affected by the presence of organic matter in the water,while A21,A51,L910,R84,U81 and X48 had better LC_(50),LC_(90),LC_(95) than the 266/29-Ⅶ-98 control *** LC_(50) of two isolates was affected by the presence of NaCl and A21,A51,R85 isolate had better larvicidal activity than the 266/29-Ⅶ-98 control *** terms of toxicity against macrophages,the extracts of nine isolates were less cytotoxic than the control ***:Native isolate A21 had the main virulence factors against *** larvae,displayed a good larvicidal activity in presence of different factors related with *** breeding sites,and had low citotoxicity against *** results can contribute to the improvement of existing biological control strategies and the development of new biolarvicides.

关键词： Mosquitoes Biological control agent Bacillus thuringiensis Bioassays Aedes aegypti cry and cyt genes

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