Antioxidative defense under salt stress

被引:383
作者
Abogadallah, Gaber M. [1 ]
机构
[1] Fac Sci New Damietta, Dept Bot, New Damietta, Egypt
关键词
salt stress; generation of ROS; type of photosynthesis; scavenging of ROS; preventive antioxidative defense;
D O I
10.4161/psb.5.4.10873
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
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 CO2 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.
引用
收藏
页码:369 / 374
页数:6
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