Creation of Rice Core Germplasm Breeding Systems and Practices in Good-quality Rice Breeding

Rice core germplasm breeding systems of theory and breeding materials were created by research team of Guangdong Academy of Agricultural Sciences in order to realize no-slot joint of rice breeding and rice germplasm resources, effective integration of conventional breeding techniques and advanced and applicable technology. Rice core germ plasm breeding theoretical systems including the co nception of rice core germplasms, corresponding hypothesis between ideal gene system and breakthrough rice variety, creation of ideal model, comprehensive arrangement of foreground selection and background selection, biological significances of DNA block, phenotypes of rice core germ plasms and cloud data of genotypes, research on rice synthesis breeding by advanced and applicable technologies, heterosis utilization of rice core germplasms were briefed. The creation of Huanghuazhan, Meixiangzhan and Huazhan core germplasm breeding material systems were traced back, and both the breakthrough varieties of Huangh uazhan with the largest indica rice promotion area in China, and Meixiangzhan No.2 with the most excellent eating quality in China, the br eakthrough restorer line of Huazhan with the most excellent combining abilit y in rice breeding history, which derived from the core germplasm breeding material systems were introduced. The present situation and direction of rice genetics and breeding were discussed.