Yamadazyma luoyangensis C.Y. Chai & F.L. Hui, 2021

Gao, Wan-Li, Li, Ying, Chai, Chun-Yue, Yan, Zhen-Li & Hui, Feng-Li, 2021, New species of Yamadazyma from rotting wood in China, MycoKeys 83, pp. 69-84 : 69

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Yamadazyma luoyangensis C.Y. Chai & F.L. Hui

sp. nov.

Yamadazyma luoyangensis C.Y. Chai & F.L. Hui sp. nov.

Figure 2 View Figure 2


China, Henan Province, Luoyang City , Song County, in rotting wood from a forest park, September 2020, J.Z. Li & Z.T Zhang (holotype NYNU 201023T, culture ex-type CBS 16666 View Materials , CICC 33509) .


The species name Yamadazyma luoyangensis refers to the geographical origin of the type strain of this species.


The cells are ovoid to ellipsoid (2-4 × 3.5-7 μm) and occur singly or in pairs after being placed in YM broth for three days at 25 °C (Figure 2A View Figure 2 ). Budding is multilateral. After three days of growth on YM agar at 25 °C, the colonies are white to cream-colored, buttery, and smooth, with entire margins. After seven days at 25 °C on a Dalmau plate culture with CM agar, pseudohyphae are formed, but true hyphae are not (Figure 2B View Figure 2 ). Asci or signs of conjugation are not observed on sporulation media. Glucose, galactose, trehalose, and cellobiose are fermented, but maltose, sucrose, melibiose, lactose, melezitose, raffinose, d-xylose, and inulin are not. Glucose, galactose, d-glucosamine, d-ribose, d-xylose, l-arabinose, d-arabinose, l-rhamnose, sucrose, maltose, trehalose, methyl α-d-glucoside, cellobiose, salicin, arbutin, melezitose, inulin, glycerol, erythritol, ribitol, d-glucitol, d-mannitol, galactitol, d-glucono-1, 5-lactone, 5-keto-d-gluconate, d-gluconate, succinate, citrate, and ethanol are assimilated. No growth is observed in l-sorbose, melibiose, lactose, raffinose, myo -inositol, 2-keto-d-gluconate, d-glucuronate, dl-lactate, or methanol. In nitrogen-assimilation tests, growth is present on ethylamine, l-lysine, glucosamine, and d-tryptophan, while growth is absent on nitrate, nitrite, cadaverine, creatine, creatinine, and imidazole. Growth is observed at 35 °C but not at 37 °C. Growth in the presence of 10% NaCl with 5% glucose is present, but growth in the presence of 0.01% cycloheximide and 1% acetic acid is absent. Starch-like compounds are not produced. Urease activity and diazonium blue B reactions are negative.

Additional isolate examined.

China, Henan Province, Luoyang City, Song County, in rotting wood from a forest park, September 2020, J.Z. Li & Z.T Zhang, NYNU 201035.

GenBank accession numbers.

Holotype NYNU 201023T (ITS: MW365549; D1/D2 LSU: MW365545); additional isolate NYNU 201035 (ITS: MZ318445; D1/D2 LSU: MZ318422).


Two isolates representing Y. luoyangensis were resolved in a well-supported clade and are most closely related to Y. mexicana (Figure 1 View Figure 1 ). Yamadazyma luoyangensis can be distinguished from Y. mexicana based on ITS and D1/D2 LSU loci (4/592 in ITS and 10/531 in D1/D2 LSU). Physiologically, Y. luoyangensis differs from Y. mexicana by its ability to assimilate inulin and 5-keto-d-gluconate and its inability to assimilate lactose, raffinose, and 2-keto-d-gluconate. Additionally, Y. mexicana grows at 37 °C, while Y. luoyangensis does not (Table 2 View Table 2 ) ( Kurtzman 2011).