| Summary: | Salinization of soil is a major environmental risk factor to plant functions, leading to a reduction of productivity of crops and forage. <i>Epichloë gansuensis</i>, seed-borne endophytic fungi, establishes a mutualistic symbiotic relationship with <i>Achnatherum inebrians</i> and confers salt tolerance in the host plants. In this study, analysis of transcriptome and metabolome was used to explore the potential molecular mechanism underlying the salt-adaptation of <i>A. inebrians</i> roots mediated by <i>E. gansuensis</i>. We found that <i>E. gansuensis</i> played an important role in the gene expression of the host’s roots and regulated multiple pathways involved in amino acid metabolism, carbohydrate metabolism, TCA cycle, secondary metabolism, and lipid metabolism in the roots of <i>A. inebrians</i>. Importantly, <i>E. gansuensis</i> significantly induced the biological processes, including exocytosis, glycolytic process, fructose metabolic process, and potassium ion transport in roots of host plants at transcriptional levels, and altered the pathways, including inositol phosphate metabolism, galactose metabolism, starch, and sucrose metabolism at metabolite levels under NaCl stress. These findings provided insight into the molecular mechanism of salt resistance in roots of <i>A. inebrians</i> mediated by <i>E. gansuensis</i> and could drive progress in the cultivation of new salt-resistance breeds with endophytes.
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