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Abstract
Bacterial strains 4M-Z03T, 4M-K16T and DHG59T were isolated from forest soil samples collected from the Dinghushan Biosphere Reserve, Guangdong Province, PR China (112° 31′ E 23° 10′ N). The three strains grew well at 28 °C, pH 5.0–6.0 on R2A medium. On the basis of 16S rRNA gene sequence analysis, the three strains, together with Dyella humi DHG40T, formed a distinct phyletic clade within the genus Dyella , and the sequence similarities between any strains of the clade ranged from 97.8 to 98.5 %. Sequence analysis of concatenated partial gyr B, lep A and rec A gene sequences also strongly suggested that the three strains represented three novel species of the genus Dyella . The respiratory lipoquinone of the three strains was ubiquinone-8, and their DNA G+C content was 58.2–59.0 mol%. The fatty acid profiles differed substantially among these three strains, although they had two common major fatty acids, iso-C15 : 0 and iso-C17 : 1ω9c. The DNA–DNA relatedness among the three strains and the type strains of the closest species of the genus Dyella examined was lower than 50 %. The results of genotypic and phenotypic characterization presented above demonstrate that the three strains examined represent three novel species of the genus Dyella , for which the names Dyella acidisoli sp. nov. (type strain 4M-Z03T=NBRC 111980T=KCTC 52131T), Dyella flagellata sp. nov. (type strain 4M-K16T=NBRC 111981T=KCTC 52130T) and Dyella nitratireducens sp. nov. (type strain DHG59T=NBRC 111472T=LMG 29201T=CGMCC 1.15439T) are proposed.
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