Biological effects of 30 keV low energy nitrogen ion implantation on the seeds of fivetypes of tomato and one type of radish were investigated.Results showed that low energy ionshave different effects on different vegetables.The whole dose-response curve of the germinationratio did not take on'the shape of saddle',but was a rising and failing waveform with the increaseor decrease in ion implantation.In the vegetable of Solanaceae,two outstanding aberraut plantswere selected from M_1 of Henan No.4 tomato at a dose of 7×10^(17) nitrogen ions/cm^2,which hadthin-leaves,long-petal and nipple tip fruit stably inherited to M_7.Furthermore the analysis ofthe isozyme showed that the activity of the mutant tomato seedling was distinct in quantity andcolor.In Raphanus sativns L.,the aberrances were obvious in the nmtant of radish 791 at a doseof 5×10^(17) nitrogen ions/cm^2,and the weight of succulent root and the volume of growth wereover twice the control's.At present,many species for breeding have been identified in the fieldand only stable species have been selected for the experiment of production.It is evident that thelow energy ion implantation technology has clear effects on vegetables' genetic improvement.
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