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2-(4-Hydroxyphenyl)ehyl-β- d -glucopyranoside (salidroside) and 4-(2-hydroxyethyl)phenol ( p -tyrosol) are famous food and medicine additives originally derived from alpine  Rhodiola  plants. Salidroside or  p -tyrosol production by the endophytic fungus Rac56 ( Phialocephala fortinii ) was confirmed by UPLC/Q-TOF-MS and  1 H-NMR. The fermentation conditions were optimized by orthogonal design using data processing system software. The broth fermentation results showed that salidroside and  p -tyrosol extraction yields from Rac56 were stable and reached 1.729 ± 0.06 mg and 1.990 ± 0.05 mg per mL of culture medium, respectively. The optimal conditions for salidroside and  p -tyrosol production in fermentation culture of Rac56 were determined to be 25 °C, pH values of 7 and 5, Czapek-Dox culture medium volumes of 150 mL and 50 mL in 250 mL flasks, rotation speeds of 100× g and 200× g, and fermentation durations of 7 and 15 days, respectively. Under these optimal conditions, stable yields of 2.339 ± 0.1093 mg and 2.002 ± 0.0009 mg per mL of culture medium of salidroside and  p -tyrosol, respectively, were obtained, indicating that the  P. fortinii  Rac56 strain is a promising source of these compounds.

Potential of the Endophytic Fungus Phialocephala fortinii Rac56 Found in Rhodiola Plants to Produce Salidroside and p-Tyrosol