Data Sheets on Quarantine Pests

Name: Xanthomonas translucens pv. translucens (Jones et al.) Vauterin et al. Synonyms: Xanthomonas campestris pv. translucens (Jones et al.) Dye Xanthomonas campestris pv. cerealis (Hagborg) Dye Xanthomonas campestris pv. hordei (Hagborg) Dye Xanthomonas campestris pv. secalis (Reddy et al.) Dye Xanthomonas campestris pv. undulosa (Smith et al.) Dye Taxonomic position: Bacteria: Gracilicutes Common names: Bacterial leaf streak, black chaff, BLS (English) Glume noire, brûlure bactérienne (French) Schwarzspelzigkeit (German) Quemadura bacteriana, gluma negra (Spanish) Notes on taxonomy and nomenclature: In a comprehensive study using DNA-DNA hybridization 16 DNA homology groups were recognized within the species X. campestris, and are now considered genomic species (Vauterin et al., 1995). Most if not all of the pathovars which cause disease within the family Poaceae were grouped within the revived species of X. translucens. The forms on temperate cereals are here considered to belong to the same single pathovar, X. translucens pv. translucens, though Vauterin et al. (1995) have retained, in X. translucens, the separate pathovars mentioned above under Synonyms. Members of this pathovar form a distinct group by fatty acid analysis (Stead, 1989), constituting FAME cluster 9 of Yang et al. (1993); their affinities are confirmed by SDSPAGE of proteins and DNA:DNA hybridization (Kersters et al., 1989; Vauterin et al., 1992). Waney et al. (1991) have identified specific genes within X. translucens pv. translucens conferring host specificity on certain cereals. Bayer computer code: XANTTR (the codes XANTTU, XANTSC, XANTCH, XANTCE previously used for the forms on different cereals can be considered obsolete). EPPO A2 list: No. 183