Increases the Tolerance of to Low-P Stress by Modulating Amino Acids Metabolism and Phosphorus Utilization Efficiency.

In the long-term evolutionary process, and seed-borne endophytic fungi, , formed a mutually beneficial symbiosis relationship, and has an important biological role in improving the tolerance of host grasses to abiotic stress. In this work, we first assessed the effects of on dry weight, the content of C, N, P and metal ions, and metabolic pathway of amino acids, and phosphorus utilization efficiency (PUE) of at low P stress. Our results showed that the dry weights, the content of alanine, arginine, aspartic acid, glycine, glutamine, glutamic acid, L-asparagine, lysine, phenylalanine, proline, serine, threonine, and tryptophan were higher in leaves of -infected (E+) than -uninfected (E-) at low P stress. Further, increased C content of roots compared to the root of E- plant at 0.01 mM P and 0.5 mM P; increased K content of leaves compared to the leaf of E- plant at 0.01 mM P and 0.5 mM P. reduced Ca content of roots compared to the root of E- plant at 0.01 mM P and 0.5 mM P; reduced the content of Mg and Fe in leaves compared to the leaf of E- plant at 0.01 mM P and 0.5 mM P. In addition, at low P stress, most probably influenced aspartate and glutamate metabolism; valine, leucine, and isoleucine biosynthesis in leaves; and arginine and proline metabolism; alanine, aspartate, and glutamate metabolism in roots. also affected the content of organic acid and stress-related metabolites at low P stress. In conclusion, improves growth at low P stress by regulating the metabolic pathway of amino acids, amino acids content, organic acid content, and increasing PUE.