Vishniacozyma eriobotryae C. Y. Chai & F. L. Hui, 2025

Vishniacozyma eriobotryae C. Y. Chai & F. L. Hui sp. nov.

Fig. 2 D View Figure 2

Etymology.

The specific epithet eriobotryae refers to Eriobotrya, the plant genus from which the type strain was isolated.

Typus.

China. • Guizhou Prov.: Guiyang City, Guiyang Medicinal Botanical Garden (26°34'51"N, 106°42'36"E), Aug 2022, in the phylloplane of Eriobotrya japonica , L. Zhang & F. L. Hui, NYNU 229203 (holotype GDMCC 2.312 T, GenBank: OP 566897, OP 566895 ); culture ex-type PYCC 9940 View Materials GoogleMaps .

Description.

On YM agar after seven days at 20 ° C, the streak culture is yellowish cream, mucoid, glistening, and smooth, with an entire margin. After three days in YM broth at 20 ° C, cells are ovoid and ellipsoidal, 2.2–3.2 × 3.7–5.5 μm, and single; budding is polar. After one month at 20 ° C, a ring and sediment are present. In Dalmau plate culture on CMA, pseudohyphae and hyphae are not formed. Sexual structures are not observed on PDA, CMA or V 8 agar. On corn meal agar, ballistoconidia are not produced. Glucose fermentation is absent. Glucose, inulin (weak), sucrose, raffinose, melibiose, galactose, lactose, trehalose, maltose, melezitose, methyl-α-D-glucoside, cellobiose, salicin, L-sorbose (weak), L-rhamnose (weak), D-xylose, L-arabinose, D-arabinose, 5 - keto-D-gluconate, ethanol (delayed and weak), erythritol, ribitol, galactitol, D-mannitol, D-glucitol, myo-inositol, DL-lactate (delayed and weak), succinate, D-gluconate, D-glucosamine (delayed and weak), N-acetyl-D-glucosamine, 2 - keto-D-gluconate, D-glucuronate, and glucono- 1, 5 - lactone are assimilated as sole carbon sources. Methanol and glycerol are not assimilated. Nitrate (delayed and weak), nitrite (delayed and weak), ethylamine (delayed and weak), and cadaverine (delayed and weak) are assimilated as sole nitrogen sources. Maximum growth temperature is 30 ° C. Growth in vitamin-free medium is positive. Growth on 50 % (w / w) glucose-yeast extract agar is negative. Starch-like substances are not produced. Urease activity is positive. Diazonium Blue B reaction is positive.

Additional strain examined.

China. • Guizhou Prov.: Guiyang City, Guiyang Medicinal Botanical Garden (26°34'51"N, 106°42'36"E), Aug 2022, in the phylloplane of Buddleja davidii , L. Zhang & F. L. Hui, NYNU 229144 (GenBank: PP 580371 , PP 580369 ) GoogleMaps .

Note.

V. eriobotryae assimilated nitrate as a sole source of nitrogen in a liquid medium, but not nitrite. If a yeast strain assimilates nitrate, it is expected to assimilate nitrite as well ( Kurtzman et al. 2011). Nitrite is rather toxic, therefore, the auxanographic method was used to test the ability to utilize nitrite. On solid media, V. eriobotryae can weakly assimilate nitrate as a sole nitrogen source.