Abstract
In Senegal, millet is the most exploited cereal and the second most one consumed after rice. It is cultivated in most agroecological zones whose more or less arid climatic characteristics favor the development of several insect pests, among which Sitophilus Zeamais, a beetle of the Curculionidae. This insect causes a lot of losses of millet stocks, mainly in four agro-ecological zones: NBA , SBA , SOHC and BMC .
Our study aims to highlight a possible genetic structuring of Sitophilus Zeamais subservient to millet according to these agroecological zones.
The advantage of the existence of a genetic differentiation between agroecological zones is to be able to detect after the degree of genetic homogeneity of each one of them and consequently their impacts on the survival or the extinction of the insect, because the genetic diversity of populations influences their adaptive potentials.
To achieve this goal, we sampled Sitophilus Zeamais insects subservient to millet in each agroecological zone. 43 individuals were harvested in total.
The exploitation of the sequences of the cytochrome b gene corresponding to these individuals has highlighted a genetic structuration of Sitophilus Zeamais subservient to millet according to the 4 agroecological zones, attested by the values of genetic distance, Fst ones and corroborated by the results of the test. AMOVA.
KEYWORDS : Sitophilus Zeamais, cytochrome b, millet, genetic structuring.