Simulation of evolution of the legume-rhizobia symbiosis under the conditions of ecological instability

The mathematical model is constructed which describes the impacts of chaotically changing environment on the frequencies and productivity of partners in the legume-rhizobia symbiosis. The most sensitive for external impacts are the adaptively prospective bacteria strains which are specific with respect to hosts and are capable for the intensive evolution towards an improved symbiotic efficiency. An increased stability of these strains in symbiotic system may be an important factor of its evolution for the improved efficiency of partners’ interaction.