Strain of Penicillium sp. Dag 2 isolated from the Caspian Sea, Russia
2025
Khalilova, Eslanda | Chernyh, Nicolai | Islammagomedova, Elvira | Abakarova, Aida | Aliverdieva, Dinara
A strain of Penicillium sp. Dag 2 (PV250222) was isolated from seawater in the Caspian Sea (coastal area of the Samursky Nature Reserve, Republic of Dagestan, Russia). Morphologically, Penicillium sp. Dag 2 cells are spherical, 5.0×5.0 µm in size; they form glossy, convex, opaque, creamy-white colonies, 3–10 mm in diameter. Strain Dag 2 is a moderate halophile, tolerating up to 13.0% NaCl, and grows across a range of temperatures (0-10, 23-28, 30-37, and 35-40°C) and pH levels (5.6, 8.4-8.5). It utilizes monomeric sugars (L-glucose, D-mannose, D-sucrose, D-arabinose, D-xylose, D-lactose, D-maltose) as carbon and energy sources, as well as alcohols (D-sorbitol, D-mannitol, D-inositol, D-erythritol); does not produce indole or assimilate lysine or ornithine; capable of producing hydrolytic enzymes catalase, ?-amylase, ?-glucosidase, cellulase, lipase, pectinase, protease, xynalase; urease-, oxidase-, glucoamylase- and ?-galactosidase-negative. The strain exhibited high sensitivity to the antibiotics nystatin, itraconazole, ketoconazole, clotrimazole, and fluconazole. Penicillium sp. Dag 2 demonstrated resistance to potassium tellurite and the pathogenic bacteria E. coli, St. aureus, and Kl. oxytoca. These studies enhanced our understanding of marine fungal ecology and distribution, and enabled the isolation of Penicillium sp. Dag 2, a strain with potential industrial applications.
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