Abstract
Asian cultivated rice Oryza sativa L. is a major food crop in the world and African cultivated rice Oryza glaberrima Steud. is endemic in West Africa. Two cultivated species and the other wild species including ancestors of the two cultivated species possess AA genome constitution (2n=24). They are easily crossed and introgressed each other, although reproductive barriers exist among them.
To broaden rice genetic resources as well as to exploit and analyze the significant and specific traits, series of introgression lines (ILs) with the background of O. sativa have been developed using backcrossing and DNA marker assisted selection. Many naturally occurring variations have been observed during the process of development of ILs. The process of the development and genetic traits regarding to reproductive barriers and domestication found in the development are introduced in this presentation.
