Saxena Ina, Srikanth Sandhya, Chen Zhong
Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University Singapore, Singapore.
Front Plant Sci. 2016 Apr 28;7:570. doi: 10.3389/fpls.2016.00570. eCollection 2016.
It is well established that oxidative stress is an important cause of cellular damage. During stress conditions, plants have evolved regulatory mechanisms to adapt to various environmental stresses. One of the consequences of stress is an increase in the cellular concentration of reactive oxygen species, which is subsequently converted to H2O2. H2O2 is continuously produced as the byproduct of oxidative plant aerobic metabolism. Organelles with a high oxidizing metabolic activity or with an intense rate of electron flow, such as chloroplasts, mitochondria, or peroxisomes are major sources of H2O2 production. H2O2 acts as a versatile molecule because of its dual role in cells. Under normal conditions, H2O2 immerges as an important factor during many biological processes. It has been established that it acts as a secondary messenger in signal transduction networks. In this review, we discuss potential roles of H2O2 and other signaling molecules during various stress responses.
氧化应激是细胞损伤的一个重要原因，这一点已得到充分证实。在应激条件下，植物进化出了调节机制以适应各种环境胁迫。胁迫的后果之一是细胞内活性氧物质浓度增加，随后这些物质会转化为过氧化氢（H₂O₂）。H₂O₂作为植物有氧氧化代谢的副产物持续产生。具有高氧化代谢活性或电子流速率高的细胞器，如叶绿体、线粒体或过氧化物酶体，是H₂O₂产生的主要来源。由于H₂O₂在细胞中具有双重作用，它是一种多功能分子。在正常条件下，H₂O₂在许多生物过程中是一个重要因素。已经确定它在信号转导网络中作为第二信使发挥作用。在本综述中，我们讨论了H₂O₂和其他信号分子在各种应激反应中的潜在作用。
