CAJ | 학술논문

为科学选择石漠化环境恢复治理的植物材料和深入了解岩生植物的耐旱机制，以喀斯特石生穗枝赤齿藓(Erythrodoutium j uluceum )为实验材料，研究了干旱胁迫对其抗氧化酶防御系统的影响。结果表明：超氧化酶歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)活性，超氧阴离子(O －2?)、丙二醛(MDA)含量呈现出先升后降的趋势；类胡萝卜素(Car)含量一直升高，质膜相对透性呈现出“抛物线”的变化趋势，可溶性蛋白含量波动变化。因此，干旱胁迫早期由于 O －2?等活性氧的增加而启动活性氧清除系统进行清除，是抵御干旱的一种协同反应；后期穗枝赤齿藓依然保持较强的自由基清除能力，具有极强的耐旱能力。所以在长期的进化过程中，喀斯特石生藓类形成具有适合干旱变化的系列生理和代谢机制，通过形态上的变化来降低水分的散失，通过生理上的调整来应付环境的恶劣变化，这对于在石漠化地区揭示苔藓植物的抗逆机制，利用苔藓植物的先锋拓荒作用治理石漠化生态环境以及对退化生态系统进行人工恢复治理具有重要价值。
위과학선택석막화배경회복치리적식물재료화심입료해암생식물적내한궤제，이객사특석생수지적치선(Erythrodoutium j uluceum )위실험재료，연구료간한협박대기항양화매방어계통적영향。결과표명：초양화매기화매(SOD)、과양화경매(CAT)、과양화물매(POD)활성，초양음리자(O －2?)、병이철(MDA)함량정현출선승후강적추세；류호라복소(Car)함량일직승고，질막상대투성정현출“포물선”적변화추세，가용성단백함량파동변화。인차，간한협박조기유우 O －2?등활성양적증가이계동활성양청제계통진행청제，시저어간한적일충협동반응；후기수지적치선의연보지교강적자유기청제능력，구유겁강적내한능력。소이재장기적진화과정중，객사특석생선류형성구유괄합간한변화적계렬생리화대사궤제，통과형태상적변화래강저수분적산실，통과생리상적조정래응부배경적악렬변화，저대우재석막화지구게시태선식물적항역궤제，이용태선식물적선봉탁황작용치리석막화생태배경이급대퇴화생태계통진행인공회복치리구유중요개치。
The research focuses on the antioxidant defense system of E .juluceum by PEG-6000 simulated drought stress conditions.The contents of E .juluceum superoxide dismutase dismutase (SOD),catalase (CAT),peroxidase (POD)activity,superoxide anion (O-2 ?)and malondialdehyde (MDA)content increased,and at late declined.The carotenoids (Car)content always increasing.As for the relative permeability of membrane,E .juluceum were shown a trend of the parabola and increased in varying degrees, and the soluble protein content in variation of fluctuate.Therefore,the increases in drought stress early O-2 ? and other reactive oxygen species (ROS)induce en-zymatic and non-enzymatic scavenging system to start to clear ROS.Keep the radical scavenging ability and strong a-bility of drought tolerance.So,in the long process of evolution,karst epilithic mosses formed with a series of physio-logical changes and metabolic mechanism for drought,through the change in morphology to reduce water loss,bad by changes in physiological regulation to cope with the environment,which for the mechanism of resistance to reveal the bryophytes inrocky desertification area,the use of pioneer the pioneering role of bryophytes in rocky desertifica-tion control and ecological environment have important value of artificialrestoration of degraded ecosystem.