EFFECTS OF Cd 2+ ,Hg 2+ ON GROWTH AND ACTIVITY OF SUPEROXIDE DISMUTASE AND PEROXIDASE IN TRAPA BISPINOSA ROXB.SEEDLINGS

• Cd~(2+)、hg~(2+)对菱幼苗生长及其超氧化物歧化酶、过氧化物酶活性的影响