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Effects of Phosphorus on Cadmium Tolerance and Accumulation in a Dark Septate Endophyte

: This study evaluated the effects of different phosphorus (P) concentrations on the growth of the dark septate endophyte (DSE)-Exophiala pinsciphila strain (ACCC 32496) under cadmium stress (100 mg L -1 ). Also evaluated were the mineral nutrient contents (calcium, magnesium, nitrogen, phosphorus, and sulfur) and cadmium accumulation in the fungus. The mycelial mineral contents (Ca, Mg, S) and the culture media pH at low P concentrations (0.37-3.64 mmol L -1 ) were higher than at high P conditions (18.35-36.7 mmol·L -1 ). The highest biomass, P content, and Cd content and accumulation in mycelium were obtained at high (18.35-36.7 mmol·L -1 ) P conditions. The mycelial biomass and Cd contents were significantly positively correlated with the mycelial P content. We conclude that high P concentrations improve the P content of DSE mycelium, enhance Cd tolerance in DSE, and increase Cd accumulation in mycelium.