淹水胁迫对水库消落带狗牙根保护酶活性的影响

THE EFFECTS OF SUBMERGENCE ON PROTECTIVE ENZYME ACTIVITIES OF BEMUDAGRASS GROWTH IN WATER- LEVEL- FLUCTUATION ZONE OF RESERVOIR

选取浙江省长潭水库自然消落带生长的野生狗牙根与非消落带生长的野生狗牙根,置于水库支流进行不同时间淹水处理,观察其在淹水胁迫条件下不同生境狗牙根的保护酶活性和丙二醛含量变化情况,结果表明:两种生境下的狗牙根叶片的MDA含量都表现上升的趋势,但消落带生境下的狗牙根叶片MDA含量上升幅度要比非消落带生境下的狗牙根MDA含量上升速度要慢。在淹水前期,狗牙根叶片SOD、POD酶活性都有所上升,淹水后期,这两种酶活性都有所下降,但消落带生境下的狗牙根叶片保护酶活性在涝渍期间始终高于非消落带生境下的狗牙根。说明了消落带生境下的狗牙根由于长期生长在水淹胁迫环境,对涝渍的适应性要强于非消落带生境下的狗牙根。

The submergence experiment was conducted on Bermudagrasses originally growth in water - level - fluctuation zone and non - water- level -fluctuation zone in branch stream of Changtan reservoir area, Zhejiang province. Two treatment with submerged time of 15 and 30 days were carried out to investigated the protective enzyme activities and MDA contents of Bermudagrass. The results showed that the leaf MDA contents of Bermudagrass originally growth in water - level - fluctuation zone increased more slowly than those growth in non - water - level - fluctuation zone after submergence. At the early stage of submergence, leaf SOD and POD activi- ties of two treatments were obviously increased while those of two treatments were obviously decreased at the late stage of submergence. But leaf protective enzyme of Bermudagrasses originally growth in water - level - fluctuation zone is higher than that growth in non - wa- ter - level - fluctuation zone during submergence. It indicated that the adaptation of Bermudagrasses originally growth in water - level - fluctuation zone is stronger than that growth in non - water - level - fluctuation zone.