This study compares genetic variation in morpho-physiological traits within and among five groups of Oryza species. Several morphological and phenological characters were measured in field trials. Results showed that genetic variation exits among and within these groups for the characters measured. More O. glaberrima and traditional O. sativa possess attributes which indicate they are better adapted to suboptimal growing conditions that characterize rice cultivation in West Africa, but are poor yielding. The interspecific progenies possess characters that cover the range of both their parents. Cluster analysis amalgamated some as possessing the adaptive morphological traits of their O.glaberrima parents, and the panicle and yield attributes of improved O. sativa parents. O. sativa of temperate origin, but of tropical japonica genetic background did not show characters for adaptability to the West African upland conditions, but was similar to interspecifics and other adapted genotypes groups that possess panicle and spikelet characteristics. Those ones could be exploited for extending present yield levels.Keywords : Germplasm characterization, Oryza glaberrima, Oryza sativa, genetic variation, West Africa. RESUME VARIABILITE GENETIQUE DES TRAITS MORPHOLOGIQUES ET PHYSIOLOGIQUES CHEZ LES ESPECES DE RIZ ET LEURS DESCENDANCES

Cotton is the main cash crop in Burkina Faso. However, production is highly affected by bollworms and leafworms in the last years due to the spread out of the resistance of bollworms to most used The results show that without insecticide application, the flow of transgene near the source at 2 m (4.63 %) was different and higher than those of more distant rates. With insecticide application, no transgene flow was detected at ≥ 25 m from the transgenic field. Study must be continued after commercial adoption to draw concrete conclusions and to suggest some strategies to prevent Bt cotton transgene outflow in Burkina Faso.