Antioxidant Activity and Transcriptomic Analysis of Se-Enriched Golden Oyster Mushroom Pleurotus citrinopileatus (Agaricomycetes).

Food enriched with organic selenium is considered as a good source for selenium supplementation. In the current research, we cultivated Pleurotus citrinopileatus with medium containing different levels of sodium selenate, evaluated the antioxidant activity, and sequenced the transcriptome of the Se-enriched mushroom. Selenium content in Se-enriched mushroom is dependent on selenium level in the surroundings. The ABTS total radical scavenging ability was not significantly different between selenium enriched mushroom and the control, though the total phenol content was increased in Se-enriched mushroom. Transcriptome sequencing showed a total of 1036 differentially expressed genes, including 987 upregulated genes and 49 downregulated genes. These differentially expressed genes are involved in 20 metabolic pathways, most of which are involved in carbon metabolism and amino acid biosynthesis, while many differentially expressed genes are in growth, plasma membrane, and protein binding. It needs to be noted that the sulfur metabolism and ABS transporters, which are closely related with selenium metabolism and transportation, are particularly enriched. The mushroom P. citrinopileatus has strong ability to uptake selenium from the surroundings, which modifies many biological pathways. This paper provides a theoretical reference for the development of Se-enriched fungal foods.