Infectivity and Survival of Soft-Rot Bacteria in Chinese Cabbage

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Abstract
The population of Erwinia carotovora var. carotovora in inoculated plant tissues of Chinese cabbage (Brassica pekinensis) was influenced by the presence of other microorganisms. The infection potential of the soft-rot bacterium was correlated with the relative proportion of soft-rot bacteria and other bacterial cells instead of the total soft-rot bacteria population level in the inoculum dosage. The rotting capacity of E. carotovora var. carotovora isolates was high, but decreased when the inoculum included other bacteria. E. carotovora var. carotovora was not detected in soil samples from fields where Chinese cabbage had not been cultivated or white plants were in the seedling stage following 1st planting. It was barely detectable in a field where there had been 1 previous cabbage crop.

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