1887

Abstract

The relationships of the genus , and the genus were revealed by comparative analysis of partial 16S rRNA and , and gene sequences and as concatenated nucleotide and peptide sequences. Sequence similarities of species and indicated that these may be considered to be synonyms at the molecular level. In addition, these species show an intimate relationship with species of , especially . (the type species of the genus). In terms of the current circumscription of the genus , and should be considered for amalgamation with . and comprise nitrogen-fixing strains with large pleomorphic cells that form cysts, and peritrichous flagella insertion; characteristics not included in the current circumscription of . The data are discussed in the light of whether lateral transfer of genes could be involved in the determination of significant morphological characteristics, thus leading to a problem that may be encountered more frequently: how to resolve classification of taxa based on conserved sequences with those based on their phenotype. More fundamentally, the results illuminate problems that will increasingly be encountered: by what criteria can taxa be delineated, what are the most appropriate methods for classification, and what are the proper assumptions of bacterial classification?

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2007-12-01
2019-12-08
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