CAJ | 학술논문

　　以生长在青藏高原不同海拔地区的多年生高山植物美丽风毛菊（Saussureapulchra）为研究材料，分析比较了不同海拔叶片光合色素和抗氧化酶活性等生理生化指标，以探讨高山植物对于寒冷、高紫外辐射环境的适应机理。结果表明：随着海拔的升高，叶绿素a（Chla）、叶绿素b（Chlb）含量有下降的趋势，而胡萝卜素（Car）含量则呈增加的趋势，Car/Chl与Chla/Chlb增大，美丽风毛菊叶片的紫外吸收物质、丙二醛（MDA）含量明显增加；抗氧化酶的活性也受到明显影响，其中叶片中超氧化物歧化酶（SOD）、过氧化物酶（POD）活性和过氧化氢酶（CAT）活性随海拔升高呈增强的趋势，膜脂过氧化与抗氧化物酶的变化具有不一致性，表明抗氧化系统之间存在一定的协同作用，可能在高山植物适应高寒环境的胁迫方面具有重要的作用。
　　이생장재청장고원불동해발지구적다년생고산식물미려풍모국（Saussureapulchra）위연구재료，분석비교료불동해발협편광합색소화항양화매활성등생리생화지표，이탐토고산식물대우한랭、고자외복사배경적괄응궤리。결과표명：수착해발적승고，협록소a（Chla）、협록소b（Chlb）함량유하강적추세，이호라복소（Car）함량칙정증가적추세，Car/Chl여Chla/Chlb증대，미려풍모국협편적자외흡수물질、병이철（MDA）함량명현증가；항양화매적활성야수도명현영향，기중협편중초양화물기화매（SOD）、과양화물매（POD）활성화과양화경매（CAT）활성수해발승고정증강적추세，막지과양화여항양화물매적변화구유불일치성，표명항양화계통지간존재일정적협동작용，가능재고산식물괄응고한배경적협박방면구유중요적작용。
Environmental change is likely to act as a multiple stressor ,leading to cumulative and /or synergis-tic impacts on alpine plants .The phytochemical and physiological processes have been conducted to assess the potential impacts of different altitudes in Tibet plateau .This study shows that the antioxidant enzymes activities of Saussureapulchrafrom Haibeiwere are higher than those from Xining .The level of UV -screen-ing compounds ,the concentration of malondialdehyde (MDA ) .Furthermore ,Compared with Xining ,the Chla ,Chlb and total chlorophyll contents from Haibei ,they decrease w hile Chla/Chlb and Car/Chla+ b in-crease .Therefore ,the physiological and biochemical characteristics of Saussureapulchra ,play an important role in adapting the plateau environmental stresses .