The N+ implantation experiment

taking autotetraploid rice with nucleus male sterility as materials

was finished. The off-spring colonies via N+ implantation were selected

gaining some mutants in autotetraploid rice. The characters of infertility expression of the variant single plants

treated by the abnormal low temperature during male differentiation

were studied. As a result of 25 keV N+ ion implantation with a low dose (1 × 1017 cm-2)

there were some variant single plants in the autotetraploid rice. The variant single plants represented specially in infertility. Treated by the abnormal low temperature during male differentiation

some mutants showed obviously variant characters in infertility following the morphological variation

but others preserved infertility of its parent. The segregation phenomena in the agronomic characters were visible in the lines of M3 generation

but they kept the stable infertility. It is thought that the characters of the infertility variation in the mutants may be allocated in the M3 generation .