Improving and reducing maize seed vigor were obtained by PEG, 6-BA treatments and artificial ageing, and a lot of physiological and biochemical characteristics were tested, such as SOD and α-amylase activities. The results can help us to get better understanding for the effects of seed treatment on the physiology and biochemistry during seed germination and in seedlings of maize (Zea mays L.). And the mechanism of the seed vigor change by the treatments was analyzed. The main results of the pres...