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A simple and efficient PCR method for the specific detection of Pseudomonas syringae pv phaseolicola in bean seeds

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Abstract

Using Southern blot hybridizations, it was found that the gene encoding the phaseolotoxin-insensitive ornithyl carbamoyl transferase (argK) was specific for Pseudomonas syringae pv. phaseolicola, the causal agent of the halo-blight disease. Based on these findings, a PCR protocol was developed for the specific detection of P.syringae. pv. phaseolicola in water-extracts of soaked bean seed. For this PCR protocol, two oligonucleotide primers were designed, based on the sequence of argK, which allowed the detection of a specific 1kb fragment. The protocol is simple since PCR was directly applied to bacterial suspensions, thus avoiding DNA extraction. The sensitivity of detection was increased by allowing the bacteria present in seed extracts to multiply in semi-selective media for 18h prior to PCR amplification. The detection threshold by visual detection using ethidium bromide staining was one naturally infected seed in lots of 400 to 600 seeds.

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Mosqueda-Cano, G., Herrera-Estrella, L. A simple and efficient PCR method for the specific detection of Pseudomonas syringae pv phaseolicola in bean seeds. World Journal of Microbiology and Biotechnology 13, 463–467 (1997). https://doi.org/10.1023/A:1018588503396

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  • DOI: https://doi.org/10.1023/A:1018588503396

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