[Reactive oxygen and nitrogen species in legume-rhizobial symbiosis: a review].

Published data on the role of reactive oxygen and nitrogen species (ROS and RNS, respectively) in the formation and functioning of the legume-rhizobial symbiosis are summarized. It is assumed that ROS and RNS fulfill a double function in the legume-rhizobial symbiosis by triggering the mechanisms enabling symbiosis formation and the mechanisms preventing the development of symbiotic structures (i.e., the defensive responses). A hypothetic scheme illustrating the involvement of ROS and RNS in the formation of legume-rhizobial symbiosis is proposed.