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Previous studies showed that members of the  Burkholderiales  were important in the succession of aerobic, molybdenum-dependent CO oxidizing-bacteria on volcanic soils. During these studies, four isolates were obtained from Kilauea Volcano (Hawai‘i, USA); one strain was isolated from Pico de Orizaba (Mexico) during a separate study. Based on 16S rRNA gene sequence similarities, the Pico de Orizaba isolate and the isolates from Kilauea Volcano were provisionally assigned to the genera  Burkholderia  and  Paraburkholderia , respectively. Each of the isolates possessed a form I  coxL  gene that encoded the catalytic subunit of carbon monoxide dehydrogenase (CODH); none of the most closely related type strains possessed  coxL  or oxidized CO. Genome sequences for  Paraburkholderia  type strains facilitated an analysis of 16S rRNA gene sequence similarities and average nucleotide identities (ANI). ANI did not exceed 95% (the recommended cutoff for species differentiation) for any of the pairwise comparisons among 27 reference strains related to the new isolates. However, since the highest 16S rRNA gene sequence similarity among this set of reference strains was 98.93%, DNA-DNA hybridizations (DDH) were performed for two isolates whose 16S rRNA gene sequence similarities with their nearest phylogenetic neighbors were 98.96 and 99.11%. In both cases DDH values were <16%. Based on multiple variables, four of the isolates represent novel species within the  Paraburkholderia :  Paraburkholderia hiiakae  sp. nov. (type strain I2 T  = DSM 28029 T  = LMG 27952 T );  Paraburkholderia paradisi  sp. nov. (type strain WA T  = DSM 28027 T  = LMG 27949 T );  Paraburkholderia peleae  sp. nov. (type strain PP52-1 T  = DSM 28028 T  = LMG 27950 T ); and  Paraburkholderia metrosideri  sp. nov. (type strain DNBP6-1 T  = DSM 28030 T  = LMG 28140 T ). The remaining isolate represents the first CO-oxidizing member of the  Burkholderia cepacia  complex:  Burkholderia alpina  sp. nov. (type strain PO-04-17-38 T  = DSM 28031 T  = LMG 28138 T ).

frontiers in microbiology

Volcanic Soils as Sources of Novel CO-Oxidizing Paraburkholderia and Burkholderia: Paraburkholderia hiiakae sp. nov., Paraburkholderia metrosideri sp. nov., Paraburkholderia paradisi sp. nov., Paraburkholderia peleae sp. nov., and Burkholderia alpina sp. nov. a Member of the Burkholderia cepacia Complex