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Position: Home > Articles > Responses of organic free-radicals production of overwintering conifer needles to low temperature and light. Chinese Journal of Applied Ecology 1992,3 (2) 120-124

越冬针叶有机自由基产额对低温和光照的反应

作  者:
陶大立;靳月华;杜英君;刘雅言;刘桂珍;詹瑞云
单  位:
中国科学院长春应用化学研究所;中国科学院沈阳应用生态研究所
关键词:
ESR;维生素C;针叶树;光氧化
摘  要:
以越冬针叶树苗木针叶为材料在黑暗与强光照两种条件下用ESR波谱仪检测有机自由基信号强度对不同温度的反应。结果表明:1.越冬伤害越重,针叶有机自由基产额越高;2.有机自由基产额随温度下降而增加;3.光照对有机自由基产额有明显的增强作用,且此增强作用在0℃表现最明显;4.自由基清除剂维生素C对有机自由基的产生有明显的抑制作用。据此认为红松苗的越冬伤害和有机自由基的高产额有关。在自然界针叶有机自由基的高产额主要和冬季的强日照有关,但低温也有一定作用。
译  名:
Responses of organic free-radicals production of overwintering conifer needles to low temperature and light.
作  者:
Tao Dali, Jin Yuehua, Du Yingjun (Institute of Applied Ecology, Academia Sinica, Shenyang 110015), Liu Yayan, Liu Guizhen and Zhan Ruiyun (Institute of Applied Chemistry, Academia Sinica, Changchun 130022).
关键词:
ESR, Vitamine C,Conifers, Winter photooxidation.
摘  要:
Overwinter experiment of potted and solar-exposed seedlings showed that Pinus koraiensis sustained most severe injury, Pinus sylestris var, mongolica sustained much less, while Picea koraiensis did not show any irreversible damage, ESR signals of organic free-radicals(OFR) were detected from needle pieces in dark or under 1200 μmol m~(-2)s~(-1) PFD at various temperatures in May: 1) the more severe the winter injury, the more OFR were produced; 2) the OFR production increased with lowering temperature; 3) strong illumination apparently enhanced the OFR production; and 4) as a free-radical scavenger,vitamine C inhibited the OFR production, It is suggested that the winter injury of Korean pine seedlings is related to the action of overloaded OFR and the high production of OFR in the field is dependent on strong solar radiation and low temperature.

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