Pseudomonas violetae sp. nov. and Pseudomonas emilianonis sp. nov., two new species with the ability to degrade TNT isolated from soil samples at Deception Island, maritime Antarctica

Abstract

Two motile, rod-shaped, Gram-stain-negative bacterial strains, TNT11^T and TNT19^T, were isolated from soil samples collected at Deception Island, Antarctica. According to the 16S rRNA gene sequence similarity, both strains belong to the genus Pseudomonas. Further genomic analyses based on ANI and dDDH suggested that these strains were new species. Growth of strain TNT11^T is observed at 0-30 ℃ (optimum, 20 ℃), pH 4.0-9.0 (optimum, pH 6.0) and in the presence of 0-5.0% NaCl (optimum, 1% NaCl), while for TNT19^T is observed at 0-30 ℃ (optimum between 15 and 20 ℃), pH 5.0-9.0 (optimum, pH 6.0) and in the presence of 0-5.0% NaCl (optimum between 0 and 1% NaCl). The fatty acid profile consists of the major compounds; C_16:0 and C_{16:1 ω6} for TNT11^T, and C_16:0 and C_12:0 for TNT19^T. Based on the draft genome sequences, the DNA G + C content for TNT11^T is 60.43 mol% and 58.60 mol% for TNT19^T. Based on this polyphasic study, TNT11^T and TNT19^T represent two novel species of the genus Pseudomonas, for which the proposed names are Pseudomonas violetae sp. nov. and Pseudomonas emilianonis sp. nov., respectively. The type strains are Pseudomonas violetae TNT11^T (= RGM 3443^T = LMG 32959^T) and Pseudomonas emilianonis TNT19^T (= RGM 3442^T = LMG 32960^T). Strains TNT11^T and TNT19^T were deposited to CChRGM and BCCM/LMG with entry numbers RGM 3443/LMG 32959 and RGM 3442/LMG 32960, respectively.

Keywords: Pseudomonadaceae; Pseudomonas sp.; TNT degradation, bioremediation, antarctica.