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Phylogenetic characterization of the bacterium-like organism associated with marginal chlorosis of strawberry and proposition of a Candidatus taxon for the organism, ‘Candidatus Phlomobacter fragariae’

Laboratoire de Biologie Cellulaire et Moleculaire, Institut National de la Recherche Agronomique, et Universite Victor Segalen Bordeaux 2, 33883, BP 81, Villenave d'Ornon cedex, France

Author for correspondence: Monique Garnier. Tel: +33 5 56 84 31 49. Fax: +33 5 56 84 31 59. e-mail: garnier{at}bordeaux.inra.fr

ABSTRACT

Marginal chlorosis is a new disease of strawberry which was first seen in France in 1988. A phloem-restricted bacterium-like organism was found associated with the disease. Even though the organism could not be cultured, and resembles in this way most other phloem-restricted pathogens, characterization was achieved from the sequence of its PCR-generated 16S rDNA, and comparison with other organisms. From these studies, the strawberry agent was found to be a new bacterium within group 3 of the gamma subclass of Proteobacteria, a group of Gram-negative bacteria including, in particular, insect symbionts or parasites as well as enterobacteria. Its closest relative, Arsenophonus nasoniae, is the causal agent of the son-killer trait in wasps. The two bacteria share 92% 16S rDNA sequence identity. We propose a Candidatus taxon for the marginal-chlorosis-associated bacterium, ‘Candidatus Phlomobacter fragariae’.

Key Words: ‘Candidatus Phlomobacter fragariae’ • marginal chlorosis of strawberry

The GenBank accession number for the marginal-chlorosis-associated BLO 16S rDNA sequence reported in this paper is U91515.

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