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We propose  Pseudomonas coronafaciens  sp. nov. as a new species in genus  Pseudomonas , which is diverse from  P .  syringae . We also classified strains from onions which are responsible for yellow bud (YB) disease as  P .  coronafaciens . Sequencing of 16S rRNA gene and multi-locus sequence analysis (MLSA) of housekeeping genes ( gyrB ,  rpoD ,  gltA  and  gap1  genes) for the  P .  syringae  pv.  coronafaciens  strains along with other strains of  P .  syringae  pathovars resulted in a distinct cluster separate from other  P .  syringae  pathovars. Based on DNA-DNA relatedness, pathotype strain of  P .  syringae  pv.  coronafaciens  (CFBP 2216 PT ) exhibited ≤35.5% similarity with the pathotype strains of  P .  syringae  pv.  syringae  (CFBP 1392 PT , 4702 T ) but exhibited ≥90.6% with the YB strains (YB 12–1, YB 12–4, YB 09–1). Also, the YB strains (YB 12–1, YB 12–4, YB 09–1) were able to infect only onion but not oat, rye and Italian ryegrass (common hosts for  P .  syrinage  pv.  coronafaciens ). Contrastingly,  P .  syringae  pv.  coronafaciens  strains (NCPPB 600 PT , ATCC 19608, Pcf 83–300) produced typical halo blight symptoms on oat, rye and Italian rye grass but did not produce any symptoms on onion. These results provide evidence that  P .  syringae  pv.  coronafaciens  should be elevated to a species level and the new YB strains may potentially be a novel pathovar of hereto proposed  P .  coronafaciens  species.

Pseudomonas coronafaciens sp. nov., a new phytobacterial species diverse from Pseudomonas syringae