Effects of Arbuscular Mycorrhizal Fungi Inoculation and Association with Chloris virgata on Growth and Physiological Characteristics of Leymus chinensis under Salt Stress
Arbuscular mycorrhizal fungi(AMF)widely distributed in salinized soil of Songnen Plain were able to symbiosis well with Leymus chinensis,the dominant grass species in the area,and improved its saline-alkali tolerance.Chloris virgata,a natural companion species of L.chinensis,may affect the growth of L.chinensis through interspecies interaction.However,the mechanisms underlying the association of C.virgata and the combined effects of C.virgata and AMF on L.chinensis growth had not been reported.In this study,the AMF community in the rhizosphere of L.chinensis in Songnen saline-alkali grassland was used as inoculation,and C.virgata as a companion species to establish a pot control experiment to explore the effects of AMF,C.virgata and their interaction on the growth of indigenous plant L.chinensis under salt stress.The results were as follows:(1)Salt stress significantly inhibited the growth of L.chi-nensis,but could promote the invasion of AMF on the root system of L.chinensis.(2)Under salt stress,inoculation with AMF could increase the glomalin-related soil protein(GRSP)content,aboveground bio-mass and peroxidase activity,and promote leaf growth and chlorophyll synthesis.As a companion species,C.virgata could significantly increase the chlorophyll content,catalase activity,and osmoregulatory sub-stance concentration of L.chinensis seedlings under salt stress.The combined effect of AMF and its com-panion species effectively alleviated plant damage,resulting in increased root infection,GRSP content,leaf length of L.chinensis,aboveground biomass,and catalase activity.Meanwhile the malondialdehyde content of the treatment was the lowest.(3)In the salt free stress treatment group,except for the GRSP content,catalase activity,and soluble sugar concentration,the plant growth and physiological indices of AMF inoculation,C.virgata accompanying,and their interaction treatment groups were lower than those of the control group.
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