The to tal DN A of kidney bean a nd co rn w ere int roduced into soy bean a nd theisozyme types o f peroxidase and poly phond ox idase in the prog enies w ere analy sed . Theresul ts show ed that the obvious v ariatio n w as caused in soy bean prog enies by theint roductio n o f to tal DN A of distant spieces. The change o f the iso zyme ty pes indicatedthat the foreign g enetic material has been introduced into soybea n g enome andex pressed.