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Rhodanobacter ginsengisoli sp. nov. and Rhodanobacter terrae sp. nov., isolated from soil cultivated with Korean ginseng

¹ Applied Microbiology Division, National Institute of Agricultural Science and Technology, Rural Development Administration, Suwon 441-707, Republic of Korea
² Korean Agricultural Culture Collection (KACC), Microbial Genetics Division, National Institute of Agricultural Biotechnology, Rural Development Administration, Suwon 441-707, Republic of Korea

Correspondence
Soon-Wo Kwon
swkwon{at}rda.go.kr

Two bacterial isolates from ginseng fields in Korea, strains GR17-7^T and GP18-1^T, were characterized using a polyphasic approach. Phylogenetic analysis of their 16S rRNA gene sequences revealed a clear affiliation with the Gammaproteobacteria, and showed that the closest phylogenetic relationships were with members of the genus Rhodanobacter. The 16S rRNA gene sequence similarity between strains GR17-7^T and GP18-1^T was 97.2 %. Both strains showed 16S rRNA gene sequence similarities of 95.2–96.9 % to type strains of recognized Rhodanobacter species. The G+C contents of the DNA of strains GR17-7^T and GP18-1^T were 61.0 and 62.5 mol%, respectively. According to the DNA–DNA hydridization tests, the hybridization value between strains GR17-7^T and GP18-1^T was 34 %. Strains GR17-7^T and GP18-1^T showed less than 32 % DNA–DNA relatedness with Rhodanobacter fulvus KCTC 12098^T and Rhodanobacter spathiphylli LMG 23181^T. Strains GR17-7^T and GP18-1^T were aerobic, Gram-negative, rod-shaped, and catalase- and oxidase-positive. Major fatty acids of both strains were iso-C_{17 : 1}9c and iso-C_{16 : 0}. Based on the data presented, two novel Rhodanobacter species are proposed, with the names Rhodanobacter ginsengisoli sp. nov. (type strain GR17-7^T=KACC 11762^T=DSM 18993^T) and Rhodanobacter terrae sp. nov. (type strain GP18-1^T=KACC 11761^T=DSM 19241^T).