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‘Candidatus Burkholderia calva’ and ‘Candidatus Burkholderia nigropunctata’ as leaf gall endosymbionts of African Psychotria

¹ Laboratory of Plant Biochemistry and Physiology, Department of Biology, Antwerp University, Campus Drie Eiken, Universiteitsplein 1, B-2610 Antwerp, Belgium
² Professor Emeritus, Laboratory of Molecular Biology, Department of Biochemistry, Antwerp University, Campus Drie Eiken, Universiteitsplein 1, B-2610 Antwerp, Belgium
³ Laboratory of Microbiology, Faculty of Sciences, Ghent University, Ledeganckstraat, B-9000 Ghent, Belgium
⁴ National Botanic Garden, Domein van Bouchout, B-1860 Meise, Belgium

Correspondence
Sandra Van Oevelen
sandra.vanoevelen{at}ua.ac.be

Phylogenetic 16S rRNA gene analysis was used to assign the bacterial leaf-nodulating endosymbionts of two tropical African Psychotria species to the genus Burkholderia. The microsymbionts of the different Psychotria hosts were recognized as distinct and novel species of Burkholderia on the basis of relatively low intersequence similarities and sufficiently large evolutionary distances when compared with each other and their closest validly named neighbours. The obligate endosymbiotic nature of the bacteria prevented their in vitro cultivation and the deposition of type strains to culture collections. Therefore, the provisional status Candidatus is assigned to the bacterial partners of Psychotria calva and Psychotria nigropunctata, with the proposal of the names ‘Candidatus Burkholderia calva’ and ‘Candidatus Burkholderia nigropunctata’, respectively.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of ‘Candidatus Burkholderia calva’ and ‘Candidatus Burkholderia nigropunctata’ are AY277697 and AY277698, respectively.

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