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The most devastating diseases in rice ( Oryza sativa ) are sheath blight caused by the fungal necrotroph  Rhizoctonia solani,  rice blast by hemibiotrophic fungus  Magnaporthe oryzae , and leaf blight by bacterial biotroph  Xanthomonas oryzae  ( Xoo ). It has been reported that the Class III acyl-CoA-binding proteins (ACBPs) such as those from dicots (Arabidopsis and grapevine) play a role in defence against biotrophic pathogens. Of the six Arabidopsis ( Arabidopsis thaliana ) ACBPs, AtACBP3 conferred protection in transgenic Arabidopsis against  Pseudomonas syringae,  but not the necrotrophic fungus,  Botrytis cinerea.  Similar to Arabidopsis, rice possesses six ACBPs, designated OsACBPs. The aims of this study were to test whether OsACBP5, the homologue of AtACBP3, can confer resistance against representative necrotrophic, hemibiotrophic and biotrophic phytopathogens and to understand the mechanisms in protection. Herein, when OsACBP5 was overexpressed in rice, the OsACBP5-overexpressing (OsACBP5-OE) lines exhibited enhanced disease resistance against representative necrotrophic ( R. solani  &  Cercospora oryzae ) ,  hemibiotrophic ( M. oryzae  &  Fusarium graminearum ) and biotrophic ( Xoo)  phytopathogens .  Progeny from a cross between OsACBP5-OE9 and the jasmonate (JA)-signalling deficient mutant were more susceptible than the wild type to infection by the necrotroph  R. solani.  In contrast, progeny from a cross between OsACBP5-OE9 and the salicylic acid (SA)-signalling deficient mutant was more susceptible to infection by the hemibiotroph  M. oryzae  and biotroph  Xoo . Hence, enhanced resistance of OsACBP5-OEs against representative necrotrophs appears to be JA-dependent whilst that to (hemi)biotrophs is SA-mediated.

The overexpression of OsACBP5 protects transgenic rice against necrotrophic, hemibiotrophic and biotrophic pathogens