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TEM images of R. solanacearum cells treated with (a) DMSO; (b) umbelliferone; (c) esculetin; and (d) daphnetin, respectively. Overnight cultured bacterial suspension was diluted into B medium supplemented with coumarins (50 mg/L umbelliferone, 50 mg/L esculetin and 25 mg/L daphnetin) and incubated at 30 °C for 12 h.
