Effects of Brassinolide on Antioxidative Metabolism and Photosynthesis in Achyranthes bidentata Bl.under Waterlodging

Achyranthes bidentata Bl.subjected to waterlogging stress were treated with foliar application of 0,0.025,0.05,0.1 and 0.2 mg/L brassinolide(BR) to study their effects on antioxidative metabolism and photosynthesis.The appropriate concentration of BR increased the activities of superoxide dismutase(SOD) and catalase(CAT).Meanwhile,it alleviated the membrane permeability and reduced the accumulation of malondialhyde(MDA).Photosynthetic rate(Pn) of leaves was raised significantly.Of all the treatments,the treatment of 0.1mg/L BR is the best.