Selection of susceptible and refractory lines of
Glossina morsitans centralis
for
Trypanosoma congolense
infection and their susceptibility to different pathogenic
Trypanosoma
species |
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Authors: | S K Moloo J M Kabata F Waweru R H Gooding |
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Institution: | International Livestock Research Institute (ILRI), Nairobi, Kenya, and;Department of Biological Sciences, University of Alberta, Edmonton, Canada |
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Abstract: | Abstract .In a single generation of selection, two lines of Glossina morsitans centralis were established that differed significantly in susceptibility to Trypanosoma congolense clone IL 1180. Reciprocal crosses demonstrated that susceptibility was a maternally inherited trait. Differences between the lines, to all phases of the trypanosome infection, were maintained for eight generations, whereas differences in susceptibility to midgut infections were maintained for twenty-eight generations. Thereafter, the lines did not differ in susceptibility to Trypanosoma congolense IL 1180. Susceptibility to infections with Trypanosoma congolense IL 1180 was only a weak predictor of susceptibility to T. congolense clones IL 13-E3 and K60/1, as well as clone T. brucei brucei STIB 247-L. However, the susceptible and refractory lines displayed these phenotypes when tested with Trypanosoma vivax, indicating that the factors that affect susceptibility to trypanosomes are expressed both within and outside the midgut. |
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Keywords: | Glossina morsitans centralis Trypanosoma brucei brucei T congolense T vivax refractoriness selection susceptibility |
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