Discussion
The genusDelftiawas established by Wen et al.
mainly based on 16S rRNA gene sequence. The type
species of this genus D. acidovoranswas formerly
Pseudomonas acidovorans[75]. Although strain HR4
possessed phenotypic, physiological and biochemical
differences withD. acidovoransandD. tsuruhatensis,it
has very many common characteristics withD. tsuruhatensis. Hence, on the basis of the high 16S rDNA
similarity and high DNA–DNA hybridization rate
between strain HR4 and D. tsuruhataensisATCC
BAA-554
T
, it could be a novel strain of D. tsuruhatensis
as a diazotrophic plant growth-promoting bacterium
inhibiting various plant pathogens