3种防御酶在水稻抗稻曲病中的活性变化

Activities of three defensive enzymes in rice resistant to the false smut

不同水稻品种对稻曲病抗性存在明显差异。本研究选用12个不同抗、感病水稻品种，在抽穗前7～10d，用注射法接种稻曲病菌分生孢子悬浮液。结果表明，在抗病品种中苯丙氨酸解氨酶（PAL）、过氧化物酶（POD）和多酚氧化酶（PPO）3种酶活性接种后迅速提高，变化幅度较大；而感病品种的酶活性在接种后缓慢增加，变化幅度小。由此说明，这3种防御酶与水稻抗稻曲病有一定的关系。

There is different resistance in rice varieties against the false smut. PAL, POD and PPO activities of 12 cultivars with different resistant levels to rice false smut were studied. The results suggested that the activities of these enzymes quickly enhanced at 1 d, 3 d, 5 d and 7 d after inoculation by injecting conidia of the false smut fungus at 7-10 d before heading in the resistant cultivars, but slower increase in the susceptible cultivars, and also showed that there was correlations between the cultivar resistance to the disease and the three enzymes.