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Background  Plants have evolved an array of constitutive and inducible defense strategies to restrict pathogen ingress. However, some pathogens still manage to invade plants and impair growth and productivity. Previous studies have revealed several key regulators of defense responses, and efforts have been made to use this information to develop disease resistant crop plants. These efforts are often hampered by the complexity of defense signaling pathways. To further elucidate the complexity of defense responses, we screened a population of T-DNA mutants in Colombia-0 background that displayed altered defense responses to virulent  Pseudomonas syringae  pv.  tomato  DC3000 ( Pst  DC3000).    Results  In this study, we demonstrated that the Arabidopsis  Purple Acid Phosphatse5  ( PAP5 ) gene, induced under prolonged phosphate (Pi) starvation, is required for maintaining basal resistance to certain pathogens. The expression of  PAP5  was distinctly induced only under prolonged Pi starvation and during the early stage of  Pst  DC3000 infection (6 h.p.i). T-DNA tagged mutant  pap5  displayed enhanced susceptibility to the virulent bacterial pathogen  Pst  DC3000. The  pap5  mutation greatly reduced the expression of pathogen inducible gene  PR1  compared to wild-type plants. Similarly, other defense related genes including  ICS1  and  PDF1.2  were impaired in  pap5  plants. Moreover, application of BTH (an analog of SA) restored  PR1  expression in  pap5  plants.    Conclusion  Taken together, our results demonstrate the requirement of PAP5 for maintaining basal resistance against  Pst  DC3000. Furthermore, our results provide evidence that PAP5 acts upstream of SA accumulation to regulate the expression of other defense responsive genes. We also provide the first experimental evidence indicating the role  PAP5  in plant defense responses.

Purple Acid Phosphatase5 is required for maintaining basal resistance against Pseudomonas syringaein Arabidopsis