摘要
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。
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.
出处
《西北植物学报》
CAS
CSCD
北大核心
2005年第7期1487-1498,共12页
Acta Botanica Boreali-Occidentalia Sinica
基金
引进国际先进农业科学技术项目
关键词
活性氧
叶绿体
光氧化胁迫
reactive oxygen
chloroplast
photo-oxidative stress
