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应用生态学报 ›› 2000, Vol. ›› Issue (5): 660-664.

• 研究论文 • 上一篇    下一篇

远紫外辐射对紫杉幼苗针叶膜脂过氧化及内源保护系统的影响

杜英君, 靳月华   

  1. 中国科学院沈阳应用生态研究所, 沈阳110015
  • 收稿日期:2000-04-13 修回日期:2000-06-12 出版日期:2000-09-25
  • 通讯作者: 杜英君,男,1963年生,助理研究员,主要从事植物生理研究,发表论文多篇
  • 基金资助:
    国家自然科学基金资助项目(39570579)

Effect of far-ultraviolet radiation on lipid peroxidation and inherent protection system in seedlings of Taxus cuspidata

DU Yingjun, JIN Yuehua   

  1. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110015
  • Received:2000-04-13 Revised:2000-06-12 Online:2000-09-25

摘要: 实验室条件下用远紫外线(UV-BC)光源照射紫杉幼苗,随照射时间延长,针叶的离子渗出率、膜脂过氧化水平、组织自动氧化速率及H2O2含量显著增加,可溶性蛋白、抗坏血酸、类胡萝卜素和叶绿素含量下降,叶绿体光系统II电子传递活性显著下降,外源活性氧清除剂苯甲酸钠和抗坏血酸对针叶膜脂过氧化有抑制作用;甲基紫精和DDC对针叶膜脂过氧化有促进效果,远紫外线引起的紫杉伤害可能和针叶树的越冬光氧化伤害有类似之处.紫杉苗对紫外辐射的抗性远高于一般农作物.

Abstract: The effect of far ultraviolet radiation on lipid peroxidation and inherent protection system in seedlings of Taxus cuspidata was examined with simulated UV-BC irradiation treatments. The electrolyte leakage, lipid peroxidation, tissue autoxidation and H2O2 content increased,while the contents of soluble protein, ascorbic acid, carotenoids, and chlorophyll and the photosynthetic electron transport rate of Photosystem II decreased with the increasing time of treatment. The lipid peroxidation of the needles was inhibited by exogenous scavengers sodium benzoate and ascorbate, but enhanced to some extent by methyl viologen and DDC (an inhibitor of SOD). The mechanisms of the injury of the seedlings induced by UV-BC radiation might be similar to that of photooxidation injuries of conifers in winter. However, Taxus cuspidata was much more resistant to UV-BC radiation than crops.