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Rheinheimera aquatica sp. nov., an antimicrobial activity producing bacterium isolated from freshwater culture pond.

A bacterial strain designated GR5(T) was isolated from freshwater culture pond in Taiwan during the screening of bacteria for antimicrobial compounds and characterized using the polyphasic taxonomic approach. Strain GR5(T) was Gram-negative, aerobic, greenish-yellow colored, rod-shaped, and motile by means of a polar single flagellum. Growth occurred at 10-40 degrees C (optimum, 35 degrees C), at pH 7.0-8.0 (optimum pH 8.0) and with 0-2.0% NaCl (optimum, 0.5-1.0%). The major fatty acids were C(16:1) omega7c (36.3%), C(16:0) (16.6%), C(12:0) 3-OH (12.5%) and C(18:1) omega7c (9.1%). The major respiratory quinone was Q-8. The DNA G+C content of the genomic DNA was 51.9 mol%. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain GR5(T) belonged to the genus Rheinheimera and its most closely neighbours were Rheinheimera texasensis A62-14B(T) and Rheinheimera tangshanensis JA3-B52(T) with sequence similarities of 98.1 and 97.5%, respectively. The sequence similarities to any other recognized species within Gammaproteobacteria were less than 96.5%. The mean level of DNA-DNA relatedness between strain GR5(T) and R. texasensis A62-14B(T), the strain most closely related to the isolate, was 26.5 +/- 7.6 %. On the basis of the phylogenetic and phenotypic data, strain GR5(T) should be classified as representing a novel species, for which the name Rheinheimera aquatica sp. nov. is proposed. The type strain is GR5(T) (= BCRC 80081(T) = LMG 25379(T)).

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