A total of 48 pathovars of Pseudomonas syringae and eight related species were studied by DNA-DNA hybridization (51 nuclease method) and ribotyping. The existence of nine discrete genomospecies was indicated. Genomospecies 1 corresponded to P. syringae sensu strict0 and included P. syringae pathovars syringae, aptata, lapsa, papulans, pisi, atrofaciens, aceris, panici, dysoxyli and japonica. Genomospecies 2 included P. syringae pathovars phaseolicola, ulmi, mori, lachrymans, sesami, tabaci, morsprunorum, glycinea, ciccaronei, eriobotryae, mellea, aesculi, hibisci, myricae, photiniae and dendropanacis and nome n s pec i e s Pseudomonas sa vastanoi, Pseudomonas ficuserectae, Pseudomonas meliae and Pseudomonas amygdali, which are thus synonymous. P. amygdali is the earliest valid name for this genomospecies. Genomospecies 3 included P. syringae pathovars tomato, persicae, antirrhini, maculicola, viburni, berberidis, apii, delphinii, passiflorae, p hiladelp hi, ribicola and primulae. We recommend strain CFBP 2212 of P. syringae pv. tomato to serve as the type strain. Genomospecies 4 included 'Pseudomonas coronafaciens' and P. syringae pathovars porri, garcae, striafaciens, atropurpurea, oryzae and zizaniae and corresponds to 'P. coronafaciens'. Genomospecies 5 included P. syringae pv. tremae and corresponds to Pseudomonas tremae sp. nov. Genomospecies 6 included Pseudomonas viridiflava and the presently misidentified pathotype strains of P. syringae pv. ribicola and P. syringae pv. primulae and thus corresponds to P. viridiflava. Genomospecies 7 included P. syringae pv. tagetis and P. syringae pv. helianthi. We recommend strain CFBP 1694 of P. syringae pv. tagetis to serve as a reference strain. Genomospecies 8 included P. syringae pv. theae and Pseudomonas avellanae and thus corresponds t o P. avellanae. Genomospecies 9 included P. syringae pv. cannabina and corresponds to Pseudomonas cannabina sp. nov. Ribotyping (Smal and Hincll endonucleases) could separate seven of the nine genomospecies. The unnamed genomospecies 3 and 7 will be named when phenotypic data are available for identification. Two species are described,P. tremae sp. nov. and P. cannabina sp. nov. Other species will be named when phenotypic data are available for identification. 1965 1942 1959 1968 1967 1957 1957 19681969 1957 1979 19491970 1956 1968 196119741991 1951 1935 1957 1968 1965 1923 19581974 1978 1983 196319621974 19491982 19831969 1978 19491984 1939 1967 1946 1961 1961 1966 1971 1959 1972 1976 1970 1970 1960 1972 1987 1979 1958 1983 1959 1974 1978 1977 1967 1976 1976 1976 1976 1958 1977 1974 1950 1964 1965 1965 1927 NK NK NK * Janse et al. (1996). Keywordsal., 1992). Fluorescent phytopathogenic pseudomonads cluster with species of the genus Pseudomonas sensu stricto, within rRNA-similarity group I (Palleroni, 1984), corresponding to the y branch of the Proteobacteria (Kersters et al., 1996).The taxonomy of Pseudomonas syringae and relate...
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