Gelidibacter flavus sp. nov., Isolated from Activated Sludge of Seawater Treatment System
2017
Kim, Hyun Sook | Bang, John J. | Lee, Sang-Seob
A Gram-stain-negative bacterial strain designated Con4ᵀ was isolated from activated sludge in a seawater treatment system. The strain was rod-shaped, motile, aerobic, and formed yellow-colored colonies on agar medium. Cells contained carotenoid pigments, but flexirubin-type pigments were absent. Based on 16S rRNA gene sequence analysis, the strain was assigned to the genus Gelidibacter. Optimum growth occurred at 20 °C, pH 7.0, and 1–2% (w/v) NaCl. Prominent fatty acid types were iso-C₁₅:₀, anteiso-C₁₅:₀, and iso-C₁₆:₀ 3OH. Diphosphatidylglycerol and phosphatidylethanolamine were present as the major polar lipids. MK-6 was present as major menaquinone. Strain Con4ᵀ showed the highest sequence similarity with Gelidibacter mesophilus KCTC 12106ᵀ (96.5%), Gelidibacter gilvus IC158ᵀ (96.4%), and Gelidibacter algens ACAM 536ᵀ (95.8%). The G+C mol% contents of the strain Con4ᵀ were 37.7%. Distinct morphological, physiological, and genotypic differences from the previously described taxa support the classification of strain Con4ᵀ as a representative of a novel species in the genus Gelidibacter, for which the name Gelidibacter flavus sp. nov. is proposed. The type strain is Con4ᵀ (=KEMB 41-198ᵀ = JCM 31135ᵀ).
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