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.pdfVIP

植物学通报 2006, 23 (4): 341~347 Chinese Bulletin of Botany . . 研究论文 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 * 周国贤 郭世荣 王素平 (南京农业大学园艺学院 南京 210095) 摘要 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。 关键词 黄瓜, 低氧胁迫, 外源多胺, 光合特性, 膜脂过氧化 Effects of Exogenous Polyamines on Photosynthetic Characteris- tics and Membrane Lipid Peroxidation of Cucumis sativus Seedlings under Hypoxia Stress * Guoxian Zhou, Shirong Guo , Suping Wang (College of Horticulture, Nanjing Agricultural University, Nanjing 210095) Abstract We investigated the effects of exogenous polyamines on growth, photosynthetic charac- teristics and membrane lipid peroxidation in 2 cultivars of cucumber seedlings with different resis- tance 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. Key words Cucumis sativus, hypoxia stress, exogenous polyamines, photosynthetic characteristics, membrane lipid peroxidation O 在需氧生物体中对氧化磷酸化产生 ATP 板结等都极易使植物根系供氧不足,造成低氧胁 2 必不可少; 在真核细胞中, 它也是线粒体膜上电 迫。低氧胁迫已成为影响植物生长的重要逆 子传递的最终受体(Bailey-Serres and Chang, 境因子之一(