B. thuringiensis endophytic colonization.Bacterial endophytic colonization was realized only in two treatments (B.t; B.t + MIX) due to lack of root biomass in the remaining treatments and also by our interest in evaluates the bacterial endophytic colonization mainly in these two treatments. Roots containing rhi- zospheric soil were treated according to Forchetti et al. (2007). One centimeter root section from the two treatments was aseptically excised, and homogenates were serially diluted in 0.1 M MgSO4 to enumerate the bacteria colonizing the root (cfu per cm) (Idris et al.,2007).