Trichosporon jiuqu S. Hu, Q. Y. Zhu & F. Y. Bai, 2025

Hu, Shuang, Zhu, Qi-Yang, Zhu, Hai-Yan, Liu, Jun-Yu, Shi, Yue, Qiu, Yan-Jie, Wen, Zhang, Li, Ai-Hua, Han, Pei-Jie & Bai, Feng-Yan, 2025, Yeast diversity in traditional fermented foods of ethnic minorities in China, with the descriptions of four new yeast species, IMA Fungus 16, pp. e 146163-e 146163 : e146163-

Trichosporon jiuqu S. Hu, Q. Y. Zhu & F. Y. Bai sp. nov.

Etymology.

jiu. qu. N. L. gen. neut. n. jiuqu of a Chinese traditional fermentation starter, referring to the isolation substrate of the type strain.

Type.

CHINA • Yunnan Province, Kunming City, 25.0383°N, 102.7221°E, from jiuqu made by the Li nationality, June 2023, Q. Y. Zhu. The holotype CGMCC 2.8149 (original number YKP 15-1) has been preserved in a metabolically inactive state in the China General Microbiological Culture Collection Center ( CGMCC), Beijing, China. An extype culture has been deposited in the Japan Collection of Microorganisms ( JCM), Koyadai, Japan, as JCM 36915 . GenBank accessions: ITS - PQ 363654 and LSU- PQ 363674 . The raw genome data of CGMCC 2.8149 has been deposited in GenBank under the BioSample accession numbers SAMN 47538175 .

Culture characteristics.

After growth on YM agar for 5 days at 25 ° C, colonies are white and butyrous, with a glossy, moist surface and entire margins. Cells are ovoid to ellipsoidal, 2–4 × 4–6 µm (Fig. 7 e ). Septate hyphae and arthroconidia (2–2.5 × 3–6 µm) are present after growth on MEA / YCB / PDA agar for 2 weeks at 25 ° C (Fig. 7 f, g ). After 4 weeks in YM broth at 25 ° C, sediment and pellicle were observed. Sexual structures were not observed.

Physiological characteristics of the new species are listed in Table 2 .

Notes.

T. jiuqu sp. nov. can be clearly distinguished from its close relatives in physiological and biochemical characteristics (Suppl. material 1: table S 3). T. jiuqu is the third species found exclusively in fermented foods in this genus, apart from T. caseorum and T. lactis . In fact, the emergence of other Trichosporon species in the brewing environment has also been reported. For example, T. coremiiforme , T. insectorum , and T. inkin were reported to exist in the pit mud and zaopei of strong-flavor Baijiu production ( Pu and Yan 2022; Xu et al. 2022), and T. asteroides was reported to be related to the formation of volatile compounds in Hakka rice wine ( Wang et al. 2024). Half of the species in this genus can cause internal and external infections in the human body ( Takashima et al. 2019; Takashima and Sugita 2019), so the functionality and safety of T. jiuqu require further research.

Distribution.

China.

Figures

Figure 7. Cellular morphology of the four novel species. Blastobotrys guizhouensis sp. nov. CGMCC 2.7784 T. a Vegetative cells on YM agar at 25 ° C after 3 days; b Conidiophores and conidia on PDA agar at 25 ° C after 2 weeks. Wickerhamiella shiruii sp. nov. CGMCC 2.7449 T: c Vegetative cells and pseudohyphae on YM agar at 25 ° C after 5 days; d Containing many oil droplet cells on YCB agar at 25 ° C after 2 weeks. Trichosporon jiuqu sp. nov. CGMCC 2.8149 T: e Vegetative cells on YM agar at 25 ° C after 3 days; f True hyphae on MEA agar at 25 ° C after 2 weeks; g Blastoconidia on YCB agar at 25 ° C after 2 weeks. Parajaminaea alba sp. nov. CGMCC 2.7776 T: h Vegetative cells on YM agar at 25 ° C after 3 days. i Containing oil droplet cells on PDA agar at 25 ° C after 2 weeks. Scale bars: 10 µm.