Effects of Soil Water Gradient on Stress-resistant Enzyme Activities in Phragmites australis from Yellow River Delta
Procedia Environmental Sciences
A simulated experiment with 5 soil water gradients was conducted to study the responses of peroxidase (POD) and the catalase (CAT) activities in Phragmites australis from Yellow River Delta on different water stresses. The results showed that: 1) the value of CAT was much higher than that of POD under all conditions; 2) a similar fluctuation change was present in both POD and CAT among the inundation levels generally, and the values of POD CAT were much higher under drought condition than those
... ondition than those under other inundation levels, and decreased gradually with the increasing inundation levels, except CAT value has a little rise at the inundation level of 15cm, which indicated that POD and CAT were positive to drought stress and played major role in resistance to drought in oxidative defensive systems of Phragmites australis. Both the two enzymes showed a positive response to the drought stress, and promote the ability of the Phragmites australis in resisting the drought stress. A moderate increased was presented in the CAT activity, while a sharp increased was turned up in the POD activity under the drought stress. The value of CAT activity was showed a slight increase in water stress with the value of 15 cm level, while there was no response occurred in POD activity to the high water stress.