CAJ | 학술논문

活性氧(ROS)具有双重作用,高浓度引起细胞损伤,低浓度起保护作用.在光氧化胁迫条件下,光合作用高能态的反应与O2丰富供应使叶绿体成为活性氧丰富的来源.当ROS的积累超过抗氧化剂防护系统清除能力,叶绿体及细胞不可逆的光氧化损伤就会出现.而高等植物的质粒是半自主的细胞器,有它们自己的基因组学及转录、翻译机制来控制ROS生成、保护光合作用机构免受光氧化损伤. 因此,本文就光氧化胁迫期间,叶绿体中ROS的生成、功能与防护机制进行了综述.
활성양(ROS)구유쌍중작용,고농도인기세포손상,저농도기보호작용.재광양화협박조건하,광합작용고능태적반응여O2봉부공응사협록체성위활성양봉부적래원.당ROS적적루초과항양화제방호계통청제능력,협록체급세포불가역적광양화손상취회출현.이고등식물적질립시반자주적세포기,유타문자기적기인조학급전록、번역궤제래공제ROS생성、보호광합작용궤구면수광양화손상. 인차,본문취광양화협박기간,협록체중ROS적생성、공능여방호궤제진행료종술.
Reactive oxygen has a dual function that it damages cells at high concentrations and protects cells at low concentrations.Under photo-oxidative stress,the highly energetic reactions in photosynthesis,along with sufficient oxygen supply,makes chloroplasts a particularly abundant source of reactive oxygen species.Once reactive oxygen species accumulated under photo-oxidative stress to a certain amount that the antioxidant systems in chloroplasts cannot get rid of,it may irreversibly damages chloroplasts and cells.However,the plastids in higher plants are the semi-autonomous organelles that have their own genome and transcription and translation mechanisms to control the formation of reactive oxygen species and prevent photosynthetic bodies from photo-oxidation damage.Therefore,the paper reviews and discusses the formation,functions and protective mechanisms of reactive oxygen species.