Development of the Indica-compatibilitic Japonica Lines for the Breeding of Super-rice

Hybrid sterility in rice is a complex phenomenon.In the past twenty years,we have been working on the genetic studies on hybrid sterility in rice.Six F1 pollen sterility genes,or specific compatibility genes,were identified.Among them,five loci,S-a,S-b,S-c,S-d and S-e were mapped by the use of molecular markers.The genic model was confirmed to be'one-locus sporo-gametophytic interaction'.Furthermore,we proposed the idea that the hybrid sterility between indica and japonica in rice could be overcome by development of Indica-compatibilitic Japonica line.Some of the Indica-compatibilitic Japonica lines have been developed through molecular marker-assisted selection for the specific compatibility genes.The Indica-compatibilitic Japonica line would be a powerful tool for overcoming of the Indica-Japonica hybrid sterility and for utilization of the heterosis of F1 hybrids between indica and Japonica in rice.