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BackgroundHyalodendriella sp. Ponipodef12, an endophytic fungus from a poplar hybrid, was a high producer of botrallin and TMC-264 with various bioactivities. In this study, the influences of eight metal ions (i.e., Mn2+, Na+, Mg2+, Zn2+, Cu2+, Fe2+, Fe3+ and Al3+) on botrallin and TMC-264 production in liquid culture of the endophytic fungus Hyalodendriella sp. Ponipodef12 were investigated.ResultsThree most effective metal ions (Zn2+, Cu2+ and Mg2+) along with their optimum concentrations were screened. The optimum addition time and concentrations of Zn2+, Cu2+ and Mg2+ were further obtained respectively for improving botrallin and TMC-264 production. The combination effects of Zn2+, Cu2+ and Mg2+ on the production of botrallin and TMC-264 by employing statistical method based on the central composite design (CCD) and response surface methodology (RSM) were evaluated, and two quadratic predictive models were developed for botrallin and TMC-264 production. The yields of botrallin and TMC-264, which were predicted as 144.12mg/L and 36.04mg/L respectively, were validated to be 146.51mg/L and 36.63mg/L accordingly with the optimum concentrations of Zn2+ at 0.81mmol/L, Cu2+ at 0.20mmol/L, and Mg2+ at 0.13mmol/L in medium.ConclusionThe results indicated that the enhancement of botrallin and TMC-264 accumulation in liquid culture of the endophytic fungus Hyalodendriella sp. Ponipodef12 by the metal ions and their combination should be an effective strategy

electronic journal of biotechnology

Enhancement of botrallin and TMC-264 production in liquid culture of endophytic fungus Hyalodendriella sp. Ponipodef12 after treatments with metal ions