Method for creating sorghum A3 cytoplasmic male sterility restorer line

The invention relates to a method for creating a sorghum A3 cytoplasmic male sterility restorer line. According to the invention, a specific A3 cytoplasmic male sterile line is hybridized with an A3 cytoplasmic male sterility restoration source, such that F1 is generated; the A3 cytoplasmic male sterile line is adopted as a recurrent parent, and backcrossing breeding is carried out; and through several continuous generations of selfing and backcrossing transferring, the A3 cytoplasmic male sterility restorer line with high restoration degree is obtained by breeding. According to the invention, the specific A3 cytoplasmic male sterile line is used as the recurrent parent and is used for breeding the A3 cytoplasmic male sterility restorer line. With the method, the A3 cytoplasmic male sterility restorer line with a restoration degree higher than 85% can be obtained, such that the breeding of A3 cytoplasmic grain sorghum hybrid can be accelerated.