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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 analysisamalgamated 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. Cette etude compare la variation genetique de parametres morpho-physiologiques au sein et entre cinqgroupes d\'especes Oryza. Plusieurs caracteres morphologiques et phenologiques ont ete mesures dans des essais conduits au champ. Les resultats ont montre qu\'il existe, pour les caracteres mesures, une variation genetique au sein et entre les groupes etudies. Un nombre important d\'especes O. glaberrima et O. sativa traditionnelles ont des attributs qui indiquent qu\'elles sont mieux adaptees aux conditions suboptimales de la culture de riz en Afrique occidentale. Elles ont, cependant, un rendement faible. Les descendants interspecifiques possedent des attributs qui couvrent la gamme des caracteres de leursparents. L\'analyse de groupement a identifie certains comme presentant les caracteres morphologiques d\'adaptation de leurs parents O. glaberrima, et des caracteres de panicule et de rendement des parents ameliores O. sativa. Les especes O. sativa d\'origine temperee, mais de fond genetique japonica tropical n\'ont pas demontre une capacite d\'adaptation aux conditions de culture de riz pluvial en Afrique de l\'Ouest. Par contre, elles etaient semblables aux descendants interspecifiques et autres groupes de genotypesadaptes quant aux caracteristiques des panicules et des grains. Celles-ci pourraient etre exploitees pour l\'amelioration des niveaux de rendement actuels. Keywords : Germplasm characterization, Oryza glaberrima, Oryza sativa, genetic variation, West Africa; Caracterisation de germplasm, Oryza glaberrima, Oryza sativa, variation genetique, Afrique de l'Ouest.. Agronomie Africaine Vol. 16 (1) 2004: pp. 15-32

Genetic Variability In Morphological And Physiological Traits Within And Among Rice Species And Their Interspecific Progenies