Effects of Exogenous Polyamines on Photosynthetic Characteristics and Membrane Lipid Peroxidation of Cucumis sativus Seedlings under Hypoxia Stress
外源多胺对低氧胁迫下黄瓜幼苗光合特性和膜脂过氧化的影响

We investigated the effects of exogenous polyamines on growth, photosynthetic characteristics and membrane lipid peroxidation in 2 cultivars of cucumber seedlings with different resistance to hypoxia stress. Photosynthetic rate and water utilization efficiency were increased, but malonic dialdehyde content and membrane permeability were decreased with polyamine treatment under hypoxia stress. At the same time, the fresh weight and dry weight was increased. Under hypoxia stress, the application of exogenous polyamines increased photosynthetic rate in leaves, promoted growth, and alleviated stress damage. In addition, the effect of exogenous polyamine to cultivar Zhongnong No. 8 was more obvious than that to Lübachun No. 4.