Effects of drought stress on flowering soybean physiology under different soil conditions

Soybean is highly sensitive to drought stress during its flowering period. Heinong84 (HN84) and Hefeng46 (HF46) were planted in clay loam, silty sandy clay. We studied the effects of on content membrane lipid peroxides soybean leaves, activity antioxidant enzymes, key enzymes nitrogen metabolism under different soil conditions. Our results showed that had clear physiological responses stress. With increasing stress, malondialdehyde, glutathione reductase, peroxidase levels leaves increased continuously. Superoxide dismutase, peroxidase, glutamine synthase, glutamate synthase with reaching a maximum moderate then decreased; nitrate reductase decreased Under condition sufficient water, performance three soils almost same, but there are differences stress; particularly, grown loam shows strongest resistance. In summary, state easily affected by which varies greatly among cultivars types.