Abstract:The characters of male sterile (MS) line 54257/162-5 were described , both the female 54257 and male 162-5 parents of which were Somaclones derived from IR54 and IR52 respectively. The MS line 54257/162-5 being stable was produced in the 8th generation by backcross-ing. The frequency of MS plant in the population wsa 100% , the pollen was abnormal and seedless in the condition of self pollation. Although all pollens were abortive, the pollens about 30% of the individuals were non-stainable, 50% stainable ...