Type III secretion-dependent host defence elicitation and type III secretion-independent growth within leaves by Xanthomonas campestris pv. campestris.

ABSTRACT: In many plant-bacterial interactions, loss of the type III secretion system (T3SS) severely reduces bacterial growth, symptom causation and suppression of defences in host plants. In the present study of Xanthomonas campestris pv. campestris (Xcc), Xcc strain B305 grew better than strain B186 in Arabidopsis thaliana after hydathode inoculation, and B305 strains mutated to the loss of T3SS (ΔhrcC and/or ΔhrpE; also ΔhrcCΔflgBC) grew similarly to wild-type B305 in Arabidopsis leaves. Unlike Xcc strain B186, wild-type B305 was relatively inefficient in secreting the exogenous T3S effector AvrBsT, but ΔhrcC and/or ΔhrpE attenuated the disease symptoms caused by Xcc B305, showing that the partially compromised T3SS of this strain still promotes necrotic leaf symptoms. In contrast with the T3SS-

SUBMITTER: Sun W 

PROVIDER: S-EPMC6640278 | biostudies-literature | 2011 Oct

REPOSITORIES: biostudies-literature