Abstract:
:Two strains of Gram-negative, aerobic, non-pigmented, non-motile, rod-shaped, methane-oxidizing bacteria were isolated from an acidic forest cambisol near Marburg, Germany, and were designated as strains BL2(T) and A1. These bacteria were morphologically and phenotypically similar to Methylocella palustris K(T). The cells possess a highly specific bipolar appearance. They lack the intracytoplasmic membranes common to all methane-oxidizing bacteria except Methylocella, but contain a vesicular membrane system connected to the cytoplasmic membrane. A soluble methane monooxygenase was present, but no particulate methane monooxygenase could be detected. These bacteria utilize the serine pathway for carbon assimilation. Strains BL2(T) and A1 are moderately acidophilic, mesophilic organisms capable of growth at pH values between 4.5 and 7 (with an optimum at pH 5.5) and at temperatures between 4 and 30 degrees C. Compared with Methylocella palustris K(T), these strains have greater tolerance of cold temperatures, dissolved salts and methanol. On the basis of 16S rRNA gene sequence identity, of species with validly published names, strain BL2(T) is most closely related to Methylocella palustris K(T) (97.3 % identity), Beijerinckia indica subsp. indica ATCC 9039(T) (97.1 %) and Methylocapsa acidiphila B2(T) (96.2 %). The DNA G+C content is 60 mol% and the major phospholipid fatty acid is 18 : 1omega7. Strain BL2(T) showed only 21-22 % DNA-DNA hybridization with Methylocella palustris K(T). The data therefore suggest that strains BL2(T) and A1 represent a novel species of Methylocella; the name Methylocella silvestris sp. nov. is proposed, with strain BL2(T) (=DSM 15510(T)=NCIMB 13906(T)) as the type strain.
journal_name
Int J Syst Evol Microbiolauthors
Dunfield PF,Khmelenina VN,Suzina NE,Trotsenko YA,Dedysh SNdoi
10.1099/ijs.0.02481-0keywords:
subject
Has Abstractpub_date
2003-09-01 00:00:00pages
1231-1239issue
Pt 5eissn
1466-5026issn
1466-5034journal_volume
53pub_type
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