Toxicity and decomposition activity inhibition of VO2 micro/nanoparticles to white rot fungus Phanerochaete chrysosporium

Vanadium dioxide (VO2) 2 ) is an excellent phase transition material widely used in various applications, and thus inevitably enters the environment via different routes and encounters various organisms. Nonetheless, limited information is available on the environmental hazards of VO2. 2 . In this study, we investigated the impact of two commercial VO2 2 particles, nanosized S-VO2 2 and micro-sized M-VO2 2 on the white rot fungus Phanerochaete chrysosporium. . The growth of P. chrysosporium is significantly affected by VO2 2 particles, with S-VO2 2 displaying a higher inhibitory effect on weight gain. In addition, VO2 2 at high concentrations inhibits the formation of fungal fibrous hyphae and disrupts the integrity of fungus cells as evidenced by the cell membrane damage and the loss of cytoplasm. Notably, at 200 mu g/mL, S-VO2 2 completely alters the morphology of P. chrysosporium, , while the MVO2 2 treatment does not affect the mycelium formation of P. chrysosporium. . Additionally, VO2 2 particles inhibit the laccase activity secreted by P. chrysosporium, , and thus prevent the dye decoloration and sawdust decomposition by P. chrysosporium. . The mechanism underlying this toxicity is related to the dissolution of VO2 2 and the oxidative stress induced by VO2. 2 . Overall, our findings suggest that VO2 2 nanoparticles pose significant environmental hazards and risks to white rot fungi.