Influence of pathogens on the life span of irradiated insects
1965; Elsevier BV; Volume: 7; Issue: 1 Linguagem: Inglês
10.1016/0022-2011(65)90154-0
ISSN1096-0805
Autores Tópico(s)Insect Pest Control Strategies
ResumoMicroorganisms such as Farinocystis tribolii Weiser, Adelina tribolii Bhatia, and Nosema whitei Weiser cause fatal infections in the genus Tribolium. Bacillus thuringiensis Berliner, strain CCEB, 058, is moderately pathogenic to adult Tribolium castaneum (Herbst) and Tribolium confusum duVal. The beetles infected by Adelina tribolii are more susceptible to Bacillus thuringiensis infection than are uninfected beetles. Tribolium castaneum adults infected with Farinocystis tribolii are more radiosensitive to 1000 r, 10,000 r, 30,000 r 50,000 r, and 90,000 r doses of X rays than noninfected ones. The beetles receiving Bacillus thuringiensis and having Farinocystis tribolii infection are much more damaged by sublethal and lethal doses of ionizing radiation. When Tribolium confusum beetles receive Bacillus thuringiensis following exposure to sublethal and lethal doses of X rays their life span is shortened to a week or at the most to a fortnight only. Neither sex shows any significant increased or decreased susceptibility when they receive Bacillus thuringiensis immediately and after an interval of 24 and 144 hours following exposure to sublethal and lethal doses of X rays. Ionizing radiation appears to act in the same way as B. thuringiensis, disintegrating the gut tissues and enabling the transgression of midgut bacteria into the body cavity of the host. Following irradiation those beetles die earlier which have a low stock of fat body as the result of attack by protozoan parasites.
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