Identifying Indica-japonica Characteristic of Rice Breeding Materials with Indica-japonica Differentiation InDel Markers

The characteristic of indica or japonica of 342 rice breeding materials from many provinces in China was identified with the reported 34 indica-japonica differentiation InDel molecular markers.The results showed that,based on the indica index(Fi) or the japonica index(Fj),59.65% of the tested breeding materials were typical indica(Fi≥0.90) or typical japonica(Fj≥0.90),and 26.61% of them were indica(Fi=0.75~0.89) or japonica(Fj=0.75~0.89) in which a few DNA fragments of the other subspecific type had been introduced,while only 13.74% of the tested breeding materials belonged to indicaclinous(Fi=0.61~0.74),japonicaclinous(Fj=0.61~0.74) or intermediate type(Fi or Fj=0.40~0.60).Understanding of the indica or japonica characteristic of breeding materials is very helpful to rice breeders in choosing desirable crossing parents as needed to improve rice varieties.