Effect of Water Stress on Some Physiology Indices of Pepper Leaves

Taking the Xiangyan No. 1 pepper leaves as experimental materials, the effects of relative water content and MDA content, relative membrane permeability, activity of POD and CAT, soluble sugar and proline content were studied under the water stress. The results showed that relative water content, free water content and the rates of free water and bound water decreased with the water stress severely. The relative membrane permeability, MDA content, soluble sugar and proline content had been increasing during the process of water stress. The activity of POD and CAT of severe water stress and moderate water stress firstly increased and then decreased in the period of water stress, although the time of their reaching the climacteric peak were different, the severe water stress reached the climacteric peak on the 6th day, while the moderate water stress on the 9th day. The activity of POD and CAT of mild water stress increased all the time.