Department of Botany, Faculty of Science at New Damietta, New Damietta, Egypt.
Plant Signal Behav. 2010 Apr;5(4):369-74. doi: 10.4161/psb.5.4.10873. Epub 2010 Apr 7.
Salt tolerance is a complex trait involving the coordinated action of many gene families that perform a variety of functions such as control of water loss through stomata, ion sequestration, metabolic adjustment, osmotic adjustment and antioxidative defense. In spite of the large number of publications on the role of antioxidative defense under salt stress, the relative importance of this process to overall plant salt tolerance is still a matter of controversy. In this article, the generation and scavenging of reactive oxygen species (ROS) under normal and salt stress conditions in relation to the type of photosynthesis is discussed. The CO(2) concentrating mechanism in C4 and CAM plants is expected to contribute to decreasing ROS generation. However, the available data supports this hypothesis in CAM but not in C4 plants. We discuss the specific roles of enzymatic and non enzymatic antioxidants in relation to the oxidative load in the context of whole plant salt tolerance. The possible preventive antioxidative mechanisms are also discussed.
耐盐性是一种复杂的性状，涉及许多基因家族的协调作用，这些基因家族执行各种功能，如通过气孔控制水分流失、离子螯合、代谢调节、渗透调节和抗氧化防御。尽管有大量关于盐胁迫下抗氧化防御作用的出版物，但这一过程对植物整体耐盐性的相对重要性仍存在争议。在本文中，讨论了在正常和盐胁迫条件下与光合作用类型有关的活性氧（ROS）的产生和清除。C4 和 CAM 植物中的 CO2 浓缩机制预计有助于减少 ROS 的产生。然而，现有数据支持这一假说在 CAM 中，但不在 C4 植物中。我们讨论了与整个植物耐盐性相关的氧化负荷有关的酶和非酶抗氧化剂的特定作用。还讨论了可能的预防抗氧化机制。
