The effect of unbanlance between iron and manganese on Phytolacca acinosa Roxb.root exudates were investigated with hydroponics under eight experimental group(Fe0Mn-

Fe0Mn

Fe-Mn0

Fe-Mn-

Fe-Mn

Fe Mn0

Fe Mn-

Fe Mn ) and one control group(Fe0Mn0).The soluble sugar

amino acid

pH value and membrane permeability of root exudates were determinated.The results were showed as follows: The soluble sugar content of Fe-Mn-was a little more than control

but the others were less than control

and thoese of Fe0Mn and Fe Mn reached significant level.The amino acid content of most of treatments was higher than control

Fe-Mn0 was most and showed significant difference to control.The pH values of all of treatments significantly increased except Fe0Mn

the increasing rate of Fe Mn0

Fe Mn

Fe Mn-were biggest.what's more

they made the membrane permeability of root increase.In all

both deficiency and overdose of iron and manganese resulted in changing of root exudates

and the effection of iron stress and manganese toxicity was bigger.In addition

compared to individual iron or manganese treatment

root exudates were also affeced by interaction of iron and manganese.