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In recent years, use of the DNA-intercalating dye propidium monoazide (PMA) in real-time PCR has been reported as a novel method to detect viable bacteria in different types of samples, such as food, environmental, and microbiological samples. In this study, viable cells of  Acidovorax citrulli , the causal agent of bacterial seedling blight and fruit blotch, were selectively detected and differentiated from dead cells by real-time fluorescent polymerase chain reaction amplification after the bacterial solution was treated with the DNA-binding dye PMA. The primers and TaqMan probe were based on the  A. citrulli  genome (Aave_1909, Gene ID: 4669443) and were highly specific for  A. citrulli . The detection threshold of this assay was 10 3  colony-forming units per mL (CFU/mL) in pure cell suspensions containing viable and dead cells and infected watermelon seeds. Application of this assay enables the selective detection of viable cells of  A. citrulli  and facilitates monitoring of the pathogen in watermelon and melon seeds.

Selective detection of viable seed-borne Acidovorax citrulli by real-time PCR with propidium monoazide