In this paper, the gibberellin content and the α-Amylase activity in different resistant rice varieties were measured after being inoculated by Fusarium moniliforme. The results showed the increment of gibberellin content of resistant variety was lower than that of susceptible one in both leaves and stems. At the same time, the more resistant a variety was, the less?α-Amylase activity could increase. The electrophoretic isoenzyme patterns also indicated that susceptible variety had 5 enzyme patterns, whi...