Chryseobacterium taihuense sp. nov., isolated from a eutrophic lake, and emended descriptions of the genus Chryseobacterium, Chryseobacterium taiwanense, Chryseobacterium jejuense and Chryseobacterium indoltheticum

Yu-Fan Wu, Qing-Long Wu, Shuang-Jiang Liu
International Journal of Systematic and Evolutionary Microbiology 2013, 63 (Pt 3): 913-9
Bacterial strain THMBM1(T) was isolated from decomposing algal scum that was collected during an algal bloom in Lake Taihu, Wuxi City, Jiangsu Province, China. Cells of strain THMBM1(T) were Gram-negative, facultatively anaerobic, non-motile rods. Colonies on tryptic soy agar were translucent and shiny with entire edges; yellow flexirubin-type pigments were produced. Growth was observed at 15-45 °C (optimum 30-37 °C), at pH 5.0-9.0 (optimum pH 8.0) and in the presence of 0-4.0 % (w/v) NaCl (optimum 0-1.0 %). Strain THMBM1(T) contained MK-6 as the sole respiratory quinone and sym-homospermidine as the predominant polyamine. The predominant cellular fatty acids were iso-C15 : 0 (53.2 %), iso-C17 : 0 3-OH (15.6 %) and iso-C17 : 1ω9c (11.9 %). The polar lipid profile consisted of phosphatidylethanolamine and five unidentified lipids. The DNA G+C content was 36.8 mol% (Tm). Strain THMBM1(T) was closely related to members of the genus Chryseobacterium, with 16S rRNA gene sequence similarities ranging from 92.9 to 97.2 %, the highest sequence similarities being with Chryseobacterium taiwanense BCRC 17412(T) (97.2 %) and C. gambrini 5-1St1a(T) (97.1 %). DNA-DNA relatedness between strain THMBM1(T) and C. taiwanense JCM 21767(T) and C. gambrini DSM 18014(T) was 34.1  and 23.0 %, respectively. Based on these results, it is concluded that strain THMBM1(T) represents a novel species, for which the name Chryseobacterium taihuense sp. nov. is proposed. The type strain is THMBM1(T) ( = CGMCC 1.10941(T)  = NBRC 108747(T)). Emended descriptions of the genus Chryseobacterium and C. taiwanense, C. jejuense and C. indoltheticum are also proposed.

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