Paenibacillus oceani sp. nov., isolated from surface seawater

Polycladospora coralii gen. nov., sp. nov., a novel member of the family Thermoactinomycetaceae isolated from stony coral in the South China Sea

Two novel filamentous bacteria, designated as IB182353T and IB182357, were isolated from stony coral of the South China Sea. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strains IB182353T and IB182357 were closely related to Hazenella coriacea DSM 45707T (with 93.4 and 93.5% similarity, respectively). The average nucleotide identity, average amino acid identity and digital DNA-DNA hybridization results showed that the pairwise similarities between isolate IB182353T and the other recognized Thermoactinomycetaceae species were less than 68.9, 60.5 and 21.1 %, respectively. Both strains produced aerial and substrate mycelia, grew optimally at 25-30 °C, pH 8.0-9.0 and with 2-3 % (w/v) NaCl. The cell-wall peptidoglycan type was meso-DAP and the whole-cell hydrolysates contained ribose. The polar lipids consisted of phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, one unidentified aminophospholipid and three unidentified phospholipids. The genomic DNA G+C content was 39.5 mol%. Strain IB182353T was distinguishable from its related type strains by the contents of two fatty acids, iso-C15 : 0 and iso-C17 : 1  ω10c. Based on polyphasic taxonomic characterization, we propose that strains IB182353T and IB182357 represent a novel genus and species within the family Thermoactinomycetaceae, for which the name Polycladospora coralii gen. nov. sp. nov. is proposed. The type strain is IB182353T (=MCCC 1K04631T=JCM 34206T).

Paenibacillus rhizolycopersici sp. nov., an oligotrophic bacterium isolated from a tomato plant in China

A Gram-positive, rod-shaped, motile, endospore-forming strain, DXFW5^T, was isolated from the rhizosphere soil of tomato. Strain DXFW5^T grew at 20-50 °C (optimum, 25-37 °C), pH 5-8 (optimum, pH 7) and in the presence of 3 % NaCl. It was positive for catalase and oxidase. Phylogenetic analysis using 16S rRNA gene sequences showed this strain was most closely related to Paenibacillus timonensis DSM 16943^T (98.0 %) and Paenibacillus barengoltzii DSM 22255^T (97.4 %). The DNA G+C content was 52.9 mol%. The digital DNA-DNA hybridization values between strain DXFW5^T and P. timonensis DSM 16943^T, P. barengoltzii DSM 22255^T and P. macerans DSM 24^T were 33.1, 24.9 and 21.2 %, respectively. The average nucleotide identity values between strain DXFW5^T and P. timonensis DSM 16943^T , P. barengoltzii DSM 22255^T and P. macerans DSM 24^T were 86.93, 81.77 and 75.98 %, respectively. The major fatty acids were anteiso-C_15 : 0 (55.1 %), iso-C_16 : 0 (13.2 %) and C_16 : 0 (10 %). The polar lipids of strain DXFW5^T consisted of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine two unidentified phospholipids and three unidentified lipids. MK-7 was the major isoprenoid quinone. Based on these results, it was concluded that the isolate represents a novel species of the genus Paenibacillus, for which the name Paenibacillus rhizolycopersici sp. nov. is proposed, with DXFW5^T (=ACCC 61751^T=JCM 34488^T) as the type strain.

Paenibacillus sabuli sp. nov., isolated from the South China Sea

A Gram-positive, rod-shaped, motile, spore-forming bacterium, designated strain IB182496T, was isolated from coastal sand of the South China Sea. The strain grew optimally at pH 7.0–9.0, 20–30 °C, and with NaCl 3.0–5.0 %. The predominant menaquinone was MK-7 and the major cellular fatty acids were anteiso-C15 : 0, iso-C16 : 0 and C16 : 0. The polar lipids in the cell wall included diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, three unidentified phospholipids and one unidentified lipid. The comparison of 16S rRNA gene sequences indicated that strain IB182496T was most closely related to ‘Paenibacillus sambharensis’ SMB1 and Paenibacillus tarimensis SA-7-6T with similarities of 95.7 and 95.5 %, respectively. The whole-genome average nucleotide identity values between strain IB182496T and the two reference strains were 70.8 and 70.5%, and the digital DNA–DNA hybridization values were 18.7 and 18.0 %, respectively. Genomic analyses showed that strain IB182496T presented a genome of 6.22 Mbp with chromosomal G+C content of 60.3 %, and a total of 5261 genes were predicted. The combined phylogenetic relatedness, phenotypic and genotypic features supported the conclusion that strain IB182496T should be considered as representing a novel species of the genus Paenibacillus , for which we propose the name Paenibacillus sabuli sp. nov. with the type strain IB182496T (=MCCC 1K04627T=JCM 34216T).

Paenibacillus arenilitoris sp. nov., isolated from seashore sand and genome mining revealed the biosynthesis potential as antibiotic producer

Strain IB182493^T, a marine, aerobic, Gram-stain-negative and motile bacterium, was isolated from seashore sand of South China Sea. Cells grew optimally at 25-30 °C, pH 7.0-8.0 and with 2-4% NaCl (w/v). Phylogenetic analysis based on 16S rRNA gene sequence comparison revealed that the strain formed a distinct lineage within the genus Paenibacillus, and was most closely related to Paenibacillus harenae DSM 16969 ^T (similarity 96.6%) and Paenibacillus alkaliterrae DSM 17040 ^T (similarity 96.1%). The chemotaxonomic characteristics of strain IB182493^T included MK-7 as the predominant isoprenoid quinone, anteiso-C_15:0 and iso-C_16:0 as the major cellular fatty acids and meso-diaminopimelic acid as the diagnostic diaminoacid in cell wall peptidoglycan. The polar lipids consisted of phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol and two unidentified phospholipids. The DNA G + C content of strain IB182493^T was 56.2 %. The values of whole genome average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) between the isolate and the closely related type strains were less than 84.7% and 23.6%, respectively. On the basis of phenotypic and chemotaxonomic properties, phylogenetic distinctiveness and genomic data, we named the strain as Paenibacillus arenilitoris sp. nov. and proposed that strain IB182493^T (= MCCC 1K04626^T = JCM 34215 ^T) in the genus Paenibacillus represents a novel species.