Oosporein Produced by Root Endophytic Promotes the Growth of Host Plant, , under Aluminum Stress at the Appropriate Concentration.

, a root endophyte in , enhances Al tolerance in by changing aluminum (Al) localization and the production of a siderophore, oosporein, which chelates Al for detoxification. Oosporein has various functions, including insecticidal activity, phytotoxicity, antifungal activity, and a siderophore. In our study, we focused on the detoxification effect of oosporein as a siderophore and on the growth of under Al exposure. In addition, the phytotoxicity of oosporein to was confirmed to compare with those in and as control plants. Under Al stress, oosporein promoted plant growth in seedlings at 10 ppm, which was the same concentration as that detected in roots infected with in our previous study. Oosporein also showed low phytotoxicity to compared with at even high concentrations of oosporein. These results suggest that the concentration of oosporein in roots would be maintained at the appropriate concentration to detoxify Al and would promote growth under Al stress, although oosporein would show low phytotoxicity to the natural host plant, , compared with the non-host plant, .