Aureobasidium melanogenum Zalar, Gostincar & Gunde-Cim.

Information from the abstract

Aureobasidium melanogenum (Herm. - Nijh.) Zalar, Gostincar & Gunde-Cim., BMC Genomics 15: 16 (2014) Fig. 16 Cultural characteristics. After 14 days of incubation at 25 ° C in the dark, colonies on PDA reaching 45–65 mm diam., surface flat, spreading with entire margin, zonate, orange white (5 A 2), with brownish gray (4 E 2) to olive brown (4 E 6) at the margin; on MEA reaching 65–70 mm diam., surface flat, spreading with entire margin, velvety, zonate, dark brown (6 F 8) at center, becoming brownish orange (6 C 8), with brownish gray (4 E 2) and white at the margin; on OA 60–75 mm diam., surface flat, spreading with irregular margin, velvety, grayish orange (6 B 5), with brownish gray (4 E 2) at the margin. Description. Anamorph in vitro dematiaceous hyphomycetes. Vegetative hyphae (2.3 –) 3.0–5.5 (– 8.0) μm wide, mostly hyaline, light brown to brown, branched, septate, constricted at the septa, smooth, thin-walled, getting darker and thicker with age. Conidiogenous cells (3.8 –) 5.3–11.0 (– 12.5) × (3.2 –) 4.0–7.5 (– 8.3) μm (x ̄ = 8.7 × 5.3 μm, n = 25), undifferentiated, intercalary, rarely terminal, producing conidia percurrently from indistinct lateral denticles, giving rise to conidia that aggregate in a mucoid mass, or differentiated from hyphae, hyaline to lightly melanized. Conidia (3.6 –) 5.5–8.5 (– 11.4) × (2.0 –) 2.8–6.0 μm (x ̄ = 7.1 × 4.1 μm, n = 150), obovoid to ellipsoid, or subglobose, hyaline, becoming lightly melanized with age, aseptate, occasionally with an indistinct truncated base and a hilum, guttulate, smooth-walled. Chlamydospores (10.0) 11.5–14.0 (– 16.3) μm wide (x ̄ = 12.8 μm, n = 50), frequent produced in aerial hyphae, mostly intercalary, solitary or in branched chains, subglobose to ellipsoidal, pigmented, light to dark brown, smooth-, thick-walled, septate, constricted near the septa. Endoconidia absent. Cardinal temperatures for growth. Minimum 10 ° C, optimum in the range of 25 ° C to 30 ° C. No growth at 4 ° C and 37 ° C. Strains examined. THAILAND • Chiang Mai, Mueang District, Chang Phueak, isolated from jasmine flower (Jasminum sambac; Oleaceae, Lamiales), Jul 2024, P. Kodchasee, C. Senwanna, J. Kumla and N. Suwannarach, living culture = SDBR-CMU 817; Phayao Province, Mueang District, isolated from holy basil flower (Ocimum tenuiflorum; Lamiaceae; Lamiales), Aug 2024, P. Kodchasee, C. Senwanna, J. Kumla and N. Suwannarach, living culture = SDBR-CMU 855. Habitat and distribution. Flowers of Jasminum sambac and Ocimum tenuiflorum in Thailand (this study). Aureobasidium melanogenum is found worldwide in diverse environments and materials, including air, soil, water, and indoor and plant surfaces, and is also considered an opportunistic human pathogen (Zalar et al. 2008; Gostinčar et al. 2014; Nasr et al. 2018; da Silva et al. 2024; Černoša et al. 2025; Patel et al. 2025). Notes. The multilocus phylogenetic tree (Fig. 2) showed that strains SDBR-CMU 817 and SDBR-CMU 855 clustered with other strains of A. melanogenum. The ITS, LSU, and tef 1 sequences were identical (100 % similarity) to those of A. melanogenum CBS 105.22 (ex-type), whereas the rpb 2 and tub sequences showed 98.90 % and 98.00 % similarity, respectively. The morphology of strains SDBR-CMU 817 and SDBR-CMU 855 is consistent with the species description of A. melanogenum provided by Zalar et al. (2008); therefore, both strains were identified as A. melanogenum.

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Related topics: Plant Pathogens and Fungal Diseases · Fungal Biology and Applications · Mycorrhizal Fungi and Plant Interactions