Effect of arsenic stress on the growth of root system and metabolism of active oxygen were studied in water planting and pot culture experiments.The results indicated that with the increased As concentrations,the number of radicle and the secondary root decreased,and the total length of root shortened,and the volume and weight of root became less,the activity of SOD tended to drop.The content of MDA went up and the relative permeability of plasma membrane rose,with the increasing of the concentration of ar...