1887

Abstract

Two isolates of a Gram-stain-positive, strictly aerobic, motile, rod-shaped, endospore-forming bacterium were identified during a survey of the diversity of the Agriculture Research Service Culture Collection. These strains were originally isolated from soil and have a phenotype of producing a dark pigment on tryptic soy agar. Phylogenetic analysis of the 16S rRNA gene indicated that these strains were related most closely to subsp. (99.7 % similarity) and (99.7 %). In phenotypic characterization, the novel strains were found to grow between 17 and 50 °C and can tolerate up to 9 % (w/v) NaCl. Furthermore, the strains grew in media of pH 5.5–10 (optimal growth at pH 7.0–8.0). The predominant cellular fatty acids were anteiso-C (34.8 %) and iso-C (21.9 %). The cell-wall peptidoglycan contained -diaminopimelic acid. A draft genome of both strains was completed. The DNA G+C content was 43.8 mol%. A phylogenomic analysis on the core genome of these two new strains and all members of the group revealed these two strains formed a distinct monophyletic clade with the nearest neighbour . DNA–DNA relatedness studies using DNA–DNA hybridizations showed the two strains were conspecific (93.8 %), while values with all other species (<31.5 %) were well below the species threshold of 70 %. Based on the consensus of phylogenetic and phenotypic analyses, these strains are considered to represent a novel species within the genus , for which the name sp. nov. is proposed, with type strain NRRL B-41091 (=CCUG 68786).

Keyword(s): black and Pigment
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/content/journal/ijsem/10.1099/ijsem.0.001135
2016-08-01
2024-03-28
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