Breeding method for novel japonica rice cytoplasmic sterile line

The invention discloses a breeding method for a novel japonica rice cytoplasmic sterile line. The breeding method includes the steps that 1, a japonica rice maintainer line with good comprehensive characters is bred; 2, an Indonesia paddy field valley type cytoplasmic indica sterile line (such as quan 9311A, zhong 9A and II-32A) hybridizes with the japonica rice maintainer line to harvest sterile line seeds; 3, the japonica rice maintainer line serves as recurrent parent and continuously backcrosses with the sterile line seeds until characters of the sterile line are basically consistent with those of the japonica rice maintainer line, and the sterile line is stable and regular; 4, the stable and uniform Indonesia paddy field valley type cytoplasmic japonica rice sterile line is used for hybridizing with an Indica restoring line, and a good Indica-japonica hybrid rice combination is bred. According to the breeding method for the novel japonica rice cytoplasmic sterile line, the bred Indonesia paddy field vall