We analyzed the activities of specific enzymes,esterase and peroxidase,and the electrophoresis profiling of isozymes of both the second-generation (MI) and the thirdgeneration (M2) individuals of Arabidopsis thaliana after the parental generation was treated with low-energy N+ implantation and y-radiation.Results indicated that the mutagenic effects of both treatments were inheritable.The obvious difference between N+ implantation and γ-radial on the relationship of doses and effects was also observed.For the correlation between effects and doses,the former presented a particular saddle-like patte,while the latter showed a patte of linearity.Random amplification of polymorphic DNA analysis showed that the variant DNA bands were consistent in MI and M2 generations treated with both γ-radiation and ion implantation.However,the ratio of individual plant variation between the two treatments was remarkably different.