The biological effects of nitrogen ion implantation on different genotype rice（Oryza sativa L） were studied.The results showed that there were obvious differences in physiological damages for the M1 generation

mutation frequencies and mutagenic efficiencies of chlorophyll

heading date and plant height for M2 generation of different genotypes.Treated by nitrogen ions

the varieties with high mutation frequency and mutagenic efficiency of chlorophyll in the M2 generation were not necessarily high in those of heading date and plant height.Moreover

the radiation sensitivity of Fu8530 and Fuxian No.6 which were bred by using early maturing and semidwarf mutants as maternal plant was low.The early maturing and high stature mutation were not induced with these two varieties.