收藏设为首页 广告服务联系我们在线留言

干旱区地理 ›› 2014, Vol. 37 ›› Issue (6): 1222-1230.

• 生物与土壤 • 上一篇    下一篇

UV-B辐射对生物结皮层藓类植物生理生化指标的影响

回嵘1, 2 , 李新荣 1, 2 , 赵锐明 3 , 赵昕 1, 2   

  1. 1 中国科学院寒区旱区环境与工程研究所沙坡头沙漠试验研究站, 甘肃 兰州 730000;
    2 中国科学院寒区旱区环境与工程研究所 植物逆境生理生态与生物技术实验室, 甘肃 兰州 730000;
    3 甘肃农业大学 生命科学技术学院, 甘肃 兰州 730000
  • 收稿日期:2013-12-28 修回日期:2014-02-17 出版日期:2014-11-25
  • 作者简介: 回嵘 (1985-) , 女 (回) , 甘肃省兰州市人, 博士, 主要从事生物土壤结皮逆境生理生态方面的研究. Email: huirong850623@163.com
  • 基金资助:

    国家重点基础研究发展计划 “973” 课题 (2013CB429906) ; 中国科学院知识创新工程重要方向项目 (KZCX2-EW-301-1)

Effects of enhanced UV-B radiation on physiological and biochemical indexes of moss from biological soil crusts

HUI Rong 1, 2 , LI Xin?rong 1, 2 , ZHAO Rui?ming 3 , ZHAO Xin 1, 2   

  1. 1 Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute,
    Chinese Academy of Sciences, Lanzhou 730000, Gansu, China; 2 Laboratory of Plant Stress Ecophysiology and Biotechnology,
    Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
    3 College of Life Science and Technology, Gansu Agricultural University, Lanzhou 730000, Gansu, China
  • Received:2013-12-28 Revised:2014-02-17 Online:2014-11-25

摘要:  以腾格里沙漠东南缘人工固沙植被区常见藓类结皮中的真藓 (Bryum argenteum) 和土生对齿藓 (Didymodon vinealis) 为研究对象, 通过室内模拟沙坡头地区臭氧损耗0% (对照) 、 6%、 9%和12%所达到的UV-B强度梯度 (2.75、 3.08、 3.25、 3.41 W · m -2 ) , 研究了增强UV-B辐射对两种藓类植物渗透调节物质、 膜质过氧化程度及抗氧化酶活性的影响。结果表明: 随着UV-B辐射增加, 两种藓类植物丙二醛 (MDA) 含量显著升高; 可溶性糖含量、 超氧化物歧化酶 (SOD) 及过氧化氢酶 (CAT)活性则降低; 且UV-B辐射对真藓的影响大于土生对齿藓, 说明真藓对UV-B辐射相对更敏感。本研究结果也预示着在未来UV-B辐射增强的情况下, 温带荒漠生物土壤结皮 (BSC) 的组成和结构将会发生显著变化, 这种变化将会深刻地影响BSC在荒漠生态系统中的功能, 进而影响荒漠生态系统的健康和稳定。

关键词: 紫外线-B (UV-B), 生物土壤结皮 (BSC), 渗透调节;丙二醛 (MDA), 抗氧化酶

Abstract: Taking Bryum argenteum and Didymodon vinealis crusts from an artificial vegetation area of south-eastern fringe of the Tengger Desert in northwestern China(37°32′-37°26′N, 105°02′-104°30′E)as a test object,to determine the influence of enhanced UV-B radiation on the osmotic adjustment of substances, membrane integrity, and the antioxidant enzyme system in laboratory. Simulating the depletion of the stratospheric ozone layer by 0%(control) , 6%, 9%, and 12% to obtain the levels of UV-B(2.75, 3.08, 3.25, and 3.41 W · m -2 ) , respectively. The results showed that the malondialdehyde(MDA)content of B. argenteum and D. vinealis significantly increased,while the soluble sugar content, SOD, and CAT activities decreased, with increased UV-B intensity. Moreover, the effects of soluble sugar content, MDA content, SOD, and CAT activities after UV-B exposure were greater in B. argenteum than that in D. vinealis, and suggested that B. argenteum was more sensitive to enhanced UV-B radiation than D. vinealis. These results also indicate that the composition and structure of biological soil crusts(BSC)will significantly change under future enhanced UV-B radiation, and these changes will profoundly influence the functioning of BSC in deserts and influence the health and stability of these ecosystems.

Key words: ultraviolet-B(UV-B), biological soil crust, osmotic adjustment, malondialdehyde(MDA), antioxidant enzyme

中图分类号: 

  • Q945.79