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

以抗低氧能力不同的2个黄瓜(Cucumis sativus)品种为试材, 研究了外源多胺对黄瓜幼苗植株生长、光合特性和膜脂过氧化的影响。结果表明, 外源多胺能显著提高低氧胁迫下黄瓜幼苗叶片的净光合速率和水分利用率, 降低叶片中丙二醛含量和质膜透性, 使幼苗鲜重和干重明显增加。因此在低氧胁迫下, 外源喷施多胺能提高幼苗叶片的净光合速率, 促进植株生长, 缓解胁迫对黄瓜幼苗的伤害。此外, 与抗低氧能力较强的品种绿霸春4号相比, 外源多胺对抗低氧能力较弱的品种中农8号的影响更明显。

Effects of Exogenous Polyamines on Photosynthetic Characteristics and Membrane Lipid Peroxidation of Cucumis sativus Seedlings under Hypoxia Stress

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.