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Transfer of Bacillus lentimorbus and Bacillus popilliae to the genus Paenibacillus with emended descriptions of Paenibacillus lentimorbus comb. nov. and Paenibacillus popilliae comb. nov.

¹Department of Biochemistry and Biotechnology, Royal Institute of Technology, S-100 44 Stockholm, Sweden
²Biology Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
³Department of Biological Sciences, Heriot Watt University, Edinburgh EH 14 4AS, UK

Author for correspondence: Fergus G. Priest. Tel: + 44 131 451 3464. Fax: + 44 131 451 3009. e-mail: f.g.priest{at}hw.ac.uk

ABSTRACT

Almost complete 16S rRNA gene sequences were generated for the type strains of the obligate insect pathogens Bacillus lentimorbus and Bacillus popilliae and a second strain of Bacillus popilliae (NRRL B-4081) received as ‘ Bacillus popilliae var. melolonthae’. A phylogenetic tree was constructed which grouped these strains into a well defined subcluster within the genus Paenibacillus. Bacillus popilliae NRRL B-4081 occupied an intermediate position between the type strains of Bacillus lentimorbus and Bacillus popilliae but with a marked clustering to the latter. The phylogenetic assignment of these strains to Paenibacillus is in contrast to earlier studies which placed these bacteria in the genus Bacillus, close to Bacillus subtilis. Indeed, the rRNA sequences generated in this study share less than 88% similarity to the deposited sequences for Bacillus popilliae ATCC 14706^Tand Bacillus lentimorbus ATCC 14707^T. The results obtained by using different tree algorithms, bootstrap analysis, branch lengths and verification by signature nucleotide analysis supported the reclassification of these species in the genus Paenibacillus as Paenibacillus lentimorbus comb. nov. and Paenibacillus popilliae comb. nov.

Key Words: Paenibacillus lentimorbus comb. nov. • Paenibacillus popilliae comb. nov. • insect pathogens • 16S rRNA

The GenBank accession numbers for the 16S rRNA gene sequences of Bacillus lentimorbus ATCC 14707^T, and Bacillus popilliae ATCC 14706^Tand NRRL B-4081 are AF071861, AF071859 and AF071860, respectively.

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