Characters of infertility expression on autotetraploid rice with nucleus male sterility via N~+ implantation

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 .