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In this study, we investigated the interactive effects of the arbuscular mycorrhizal fungus (AMF)  Rhizophagus irregularis  and soil bacteriomes on maize growth under salt stress (100 mM NaCl) and also the effect of salt and bacteriomes on the mycorrhizal infection levels. We found that soil bacteriomes directly promoted the growth of maize and indirectly enhanced maize biomass by increasing mycorrhizal colonization levels, irrespective of salt stress. Although  R. irregularis  by itself had no maize growth-promoting effect even at a high mycorrhizal colonization level in roots, its benefits to maize were reflected in other aspects, evidenced by the significantly increased rate of arbuscule formation (a proxy for a functional plant-AMF nutritional exchange) under salinity. A negative correlation between arbuscule colonization and root biomass suggested  R. irregularis  expands the role of maize roots. Besides, the positive correlation between the overall AMF colonization level and shoot biomass supported the tenet of a positive contribution of  R. irregularis  to maize growth. Our findings suggest that soil bacteriomes interactively work with  R. irregularis , modulating the growth of maize by affecting the colonization of AMF in roots.

Effect of soil bacteriomes on mycorrhizal colonization by Rhizophagus irregularis—interactive effects on maize (Zea mays L.) growth under salt stress