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

sp. nov.

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

Figure 4 View Figure 4


China, Yunnan Province, Jinghong City, Mengyang Town , in rotting wood from a tropical rainforest, July 2018, K.F. Liu & Z.W. Xi (holotype NYNU 1811114T, culture ex-type CBS 16010 View Materials , CICC 33365) .


The species name Yamadazyma paraaseri refers to its phylogenetic similarity to C. aaseri .


The cells are ovoid to elongate (2-2.5 × 3-8.5 μm) and occur singly or in pairs after being placed in YM broth for three days at 25 °C (Figure 4A View Figure 4 ). 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 two weeks at 25 °C on a Dalmau plate culture with CM agar, pseudohyphae consisting of elongated cells with lateral buds are formed (Figure 4B View Figure 4 ). True hyphae are not observed. Asci or signs of conjugation are not observed on sporulation media. Fermentation of sugars is absent. Glucose, galactose, l-sorbose, d-glucosamine, d-ribose, d-xylose, l-arabinose, d-arabinose, sucrose, maltose, trehalose, methyl α-d-glucoside, cellobiose, salicin, arbutin, lactose, melezitose, inulin, glycerol, erythritol, ribitol, d-glucitol, d-mannitol, d-gluconate, dl-lactate, succinate, citrate, and ethanol are assimilated. No growth is observed in l-rhamnose, melibiose, raffinose, xylitol, galactitol, myo -inositol, d-glucono-1, 5-lactone, 2-keto-d-gluconate, d-glucuronate, 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 37 °C but not at 40 °C. Growth in the presence of 0.01% cycloheximide, 10% NaCl with 5% glucose 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, Yunnan Province, Jinghong City, Mengyang Town, in rotting wood from a tropical rainforest, July 2018, K.F. Liu & Z.W. Xi, NYNU 181033.

GenBank accession numbers.

Holotype NYNU 1811114T (ITS: MK682794; D1/D2 LSU: MK682805); additional isolate NYNU 181033 (ITS: MZ318421; D1/D2 LSU: MZ318460).


Two strains representing Y. paraaseri were clustered in a well-supported clade and were phylogenetically related to C. aaseri [7]. Yamadazyma paraaseri can be distinguished from C. aaseri based on ITS and D1/D2 LSU loci (8/573 in ITS and 8/531 in D1/D2 LSU). Physiologically, the ability to assimilate d-glucosamine and inulin and the inability to assimilate xylitol and d-glucono-1, 5-lactone are the primary differences between Y. paraaseri and its closest relative, C. aaseri . Additionally, C. aaseri can grow in 10% NaCl with 5% glucose, while Y. paraaseri cannot (Table 2 View Table 2 ) ( Lachance et al. 2011).