单一稀土氧化镧Ｌａ２Ｏ３对青枯假单胞菌的生长有明显抑制作用。当Ｌａ３＋质量浓度为５０，１００，１５０，２００，２５０，３００，３５０ｍｇ／Ｌ时，与对照相比，固体平板上病菌初生长时间延迟，７天后的菌落直径减小，生长量也减少。液体培养中的生物量也比对照显著下降。当Ｌａ３＋质量浓度大于３５０ｍｇ／Ｌ时，病菌停止生长。浓度为２００ｍｇ／Ｌ的Ｌａ３＋明显刺激该病菌的胞外蛋白酶、果胶酶及纤维素酶活性。 Single rare earth lanthanum oxide La2O3 has a significant inhibitory effect on the growth of Pseudomonas solanacearum. When the concentration of La3 + was 50, 100, 150, 200, 250, 300 and 350 mg / L, the initial growth of bacteria on the solid plate was delayed compared with the control. After 7 days, the diameter of the colonies decreased and the amount of growth decreased. The biomass in liquid culture also decreased significantly compared with the control. When La3 + concentration is more than 350mg / L, the bacteria stop growing. The concentration of 200mg / L of La3 + significantly stimulated the bacteria extracellular protease, pectinase and cellulase activity.