增强UV-B辐射和SO_2作用下植物光合响应及其相对抗性  

PHOTOSYNTHETIC RESPONSES OF PLANTS TO SUPPLEMENTARY UV-B RADIATION AND SULFITE AND THEIR RESISTANCES

作　　者：孙振令[1] 彭长连[1] 孙梓健[1] 陈贻竹[1] 

机构地区：[1]中国科学院华南植物研究所,广州510650

出　　处：《植物生态学报》2003年第3期285-292,共8页Chinese Journal of Plant Ecology

基　　金：广东省自然科学基金资助项目(960792990 758);广东省环保局基金项目

摘　　要：研究了 2 0种野外生长的树种在增强UV_B、NaHSO3的作用下 ,它们的光合作用响应及其对这两种胁迫的抗性。研究结果表明 ,这些植物的抗性可分为抗性强、抗性中等和敏感 3种类型。UV_B、NaHSO3以及UV_B +NaH SO33种处理与这些植物光合作用受抑制程度呈现良好的线性关系 ,说明这些植物在防御UV_B和NaHSO3伤害的能力方面有一致性 ,没有种的特异性。结果还表明 ,在这些植物中NaHSO3增强了UV_B对它们的抑制作用 。The increase in UV_B radiation and airborne SO 2 has become a serious environmental issue. In this paper the photosynthetic responses of 20 species of common tropical and subtropical greening trees to supplementary UV_B radiation and/or SO 2 (simulated by sulfite solution) were studied. Trees were grown under natural conditions in the South China Botanic Garden. The relative resistances of these trees were estimated through the photosynthesis and chlorophyll fluorescence characteristics. Leaves were collected from the canopy of the 20 species and treated with UV_B radiation, NaHCO 3 and UV_B+NaHCO 3 for 72 h in the laboratory. Photosynthetic O 2 evolution rate of these isolated leaves was then measured by leaf disc oxygen electrode system (Hansatech, King’s Lynn, UK), and their fluorescence emission ( Fv/Fm ) was tested using a PAM_Fluorometer (Walz, Effeltrich, Germany). Results showed that these plants can be classified into three types: high resistance, medium resistance and sensitive according to their resistant abilities to supplementary UV_B and/or SO 2. They further showed that the UV_B radiation damage to the trees could be enhanced by treatment with SO 2. The inhibition induced from a single stress factor, SO 2 or UV_B, had a positive relationship with that from combined factors, UV_B+NaHCO 3, in these tested trees. The response of chlorophyll fluorescence characteristics of these trees to environmental stress and applications of this technique for studying forest ecology, environmental physiology and stress physiology were also discussed.

关 键 词：UV-B辐射 SO2 植物 光合响应 抗性 光合作用 

分 类 号：Q947[生物学—植物学]