The seeds of lndica rice (Oryza sativa) variety FAZ一5 were treated with ethyl methane sutfonate (EMS) for mutation breeding．A reduced till mutant (ret5-5)，which exhibited no tiller, was obtained from M2 population The selfed progenies M3, M4 and M5 showed 0-2 tillers．while its parents， FAZ一5，had average 8.2 or more tillers in the corresponding period The mutant ret5-5 after being crossed with FAZ-5 indicates that it is a recessive mutant and more than oue gene were mutated after the EMS treatment．
