The biosecurity hazards caused by pathogenic fungus have been widely concerned. Given the long-term coexistence of eukaryotic pathogens and quorum sensing bacteria in different habitats in environments, we hypothesized that they have social interactions via signal molecules. In this work, we firstly discovered the well-known bacterial signal molecules play an adverse role in the cell morphology and metabolism in a model pathogen Trichosporon asahii. N-Tetradecanoyl-L-homoserine lactone (C14-HSL) was discovered to increase pathogen hazards of T. asahii, which limited mycelium by 52%, but enhanced cell aggregation by 93%. Higher fluorescence intensity of tryptophan (59%) and aromatic protein (2-fold) contents after the treatment of C14-HSL, indicating that aromatic proteins helped aggregate Trichosporon and showed hydrophobicity. Transcriptome analysis revealed that C14-HSL upregulated the shikimate pathway (above 1-fold) located in downstream of tricarboxylic acid cycle, which contributed to the synthesis of more aromatic proteins and the formation of larger flocs. The limited mycelial growth of T. asahii attributed to the up-regulated expressions of cell cycle process. The fungal transboundary response to bacterial C14-HSL was controlled by signal transduction pathways. This study provides new insights into the co-evolution of bacterial and pathogenic fungi in microecosystems.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |