[Sensitivity of larvae of the malaria mosquito Anopheles messae with various inversion genotypes to the entomopathogenic bacteria Bacillus thuringiensis israelensis as a function of dose].
The influence of the entomopathogenic bacterium Bacillus thuringiensis israelensis (Bti) on the chromosomal composition of a natural population of fourth instar larvae of the malaria mosquito (Anopheles messeae Fall.) was investigated. The two doses used in the experiment yielded different death rates. A dose of 6.17 micrograms Bti per 1 mg of host mass led to a death rate of 41.1 +/- 3.0%. The chromosomal composition of the population remained unchanged, but the proportion of XL11-2R11 females decreased, and the diversity of genotypes increased due to a slight increase in proportions of heterozygotes 2R01 and 3R01. A dose of 12.34 micrograms/mg caused a death rate of 71.9 +/- 2.7%. The percentages of chromosomal variants XL1(2), 2R1, 3R1, and 3L1, as well as heterozygotes 2R01 and 3R01, decreased, thereby lessening the diversity of inversion genotypes in the population. The pathogen-related mortality is considered a quantitative index of the selection strength.
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D000818:Animals; D000852:Anopheles / Q000235:genetics* / Q000382:microbiology; D001413:Bacillus thuringiensis / Q000472:pathogenicity*; D007446:Chromosome Inversion; D002875:Chromosomes; D005838:Genotype; D006706:Homeostasis; D007814:Larva / Q000235:genetics / Q000382:microbiology; D008297:Male