松萝对天然放射性气体氡的抗性研究  

Resistance of Tillandsia usneoides to natural radioactive radon gas

作　　者：谷民天 张瑞文[1] 李鹏[1] 郑桂灵[1] GU Mintian ZHANG Ruiwen LI Peng ZHENG Guiling(College of Resource and Environment, Qingdao Agricultural University, Qingdao 266000, Chin)

机构地区：[1]青岛农业大学资源与环境学院,青岛266000

出　　处：《辐射研究与辐射工艺学报》2017年第5期58-64,共7页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金(41475132)~~

摘　　要：通过标准氡室对松萝进行不同氡浓度熏蒸处理之后,检测其植物体的各种生理指标变化。结果表明,在2 000 Bq/m^3浓度的氡胁迫下,松萝相对电导率变化与对照组相比并不显著,在4 000 Bq/m^3的高浓度氡胁迫下,电导率才显著升高。而不管氡浓度如何,松萝可溶性蛋白含量和丙二醛(Malondialdehyde,MDA)含量均与对照组差异不显著。说明松萝在氡胁迫下没有表现出明显的生理损伤特征,暗示其对氡具有较强的抗性,这可能是与其叶表存在鳞片有关。另外,松萝的过氧化氢酶(Catalase,CAT)性随着氡浓度的上升有所降低,但超氧化物歧化酶(Superoxide dismutase,SOD)活性却随着氡浓度的上升而显著升高,说明在氡胁迫下,松萝体内活性氧清除体系开始发挥作用,能够进一步减轻氡对植物的伤害。Physiological changes to Tillandsia usneoides were tested after fumigation with different concentrations of radon in a standard radon chamber. The results showed that the leaf relative electrical conductivity increased at concentration of 2 000 Bq/m^3, though not significantly different from that of the control group, which increased remarkably at concentration of 4 000 Bq/m^3. Moreover, soluble proteins and malondialdehyde contents didn＇t change much with increasing radon concentrations, i.e., no significant physiological damage induced, indicating that Tillandsia usneoides was relatively strongly resistant to radon, which was probably related to the existence of foliar trichomes on the leaf surface. In addition, superoxide dismutase content increased greatly with increasing radon concentrations, suggesting scavenging system of reactive oxygen species played a role in reducing the damage of plants exposed to radon.

关 键 词：松萝 大气污染 氧化损伤 辐射 

分 类 号：TL71[核科学技术—辐射防护及环境保护] Q948.119[生物学—植物学]