1887

Abstract

A comprehensive DNA-DNA hybridization study was performed by using 183 strains of the genus . This genus was shown to comprise 20 DNA homology groups which are considered genomic species. Four groups corresponded to the previously described species , and . The previously described species was heterogeneous and was divided into 16 DNA homology groups. One of these groups exhibited a high level of DNA homology with . The 62 pathovars represented in this study were allocated to appropriate species. Our results, together with previous taxonomic data, supported a comprehensive revision of the classification of the genus . The species , and are not affected. The type species of the genus, (Pammel 1895) Dowson 1939, is emended to include only the pathovars obtained from crucifers (i.e., pv. aberrans, pv. armoraciae, pv. barbareae, pv. campestris, pv. incanae, and pv. raphani). Starr and Garces 1950 is emended to include 34 former pathovars. The following species names are proposed: sp. nov., including pv. corylina, pv. juglandis, pv. poinsettiicola (type C strains of the former pathovar), pv. populi, and pv. pruni; sp. nov. for strains isolated from bromegrass; (ex Wiehe and Dowson 1953) sp. nov., nom. rev.; sp. nov., including type B strains of the former taxon pv. poinsettiicola; (ex Bryan 1926) sp. nov., nom. rev.; sp. nov., including pv. hederae, pv. pelargonii, and pv. vitians; (ex Wakker 1883) sp. nov., nom. rev.; sp. nov.; (ex Goto and Okabe 1958) sp. nov., nom. rev.; sp. nov. for strains isolated from diseased sugarcane in Guadeloupe; sp. nov.; (ex Jones, Johnson, and Reddy 1917) sp. nov., nom. rev., including pv. arrhenatheri, pv. cerealis, pv. graminis, pv. hordei, pv. phlei, pv. phleipratensis, pv. poae, pv. secalis, pv. translucens, and pv. undulosa; sp. nov., including pv. holcicola and pv. vasculorum (type B strains of the former taxon pv. vasculorum); and (ex Doidge 1920) sp. nov., nom. rev., which includes the type B strains of the former taxon pv. vesicatoria. Differentiating characteristics were determined for the new species on the basis of metabolic activity on a range of carbon substrates by using the Biolog GN microplate system.

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1995-07-01
2024-03-19
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