Andriantsoa, R. O., Uda, Y., Bang, S. V., Honjo, H., Fukami, M., and Fukui, R.  2003.  Effects of cruciferous plant residues incorporated into soil on survival of Ralstonia solanacearum.

  The growth and survival of rifampicin-resistant strain (301522R4) of Ralstonia solanacearum was monitored after incorporation of residues of cruciferous plants into infested soil.  Air-dried residues of nineteen cruciferous species (or cultivars) were individually added to the soil, maintained at -10 kPa, at at rate of 1.6% (w/w).  Within one-month incubation at 24℃, ten of nineteen residues reduced the population of 301522R4, and Brassica oxyrrhina, Brassicoraphanus sp., and Brassica rapa cv. 'Ayumi' were most inhibitory.  However, the population of the pathogen increased during the first week after incorporation of residues of Orychophragmus violaceus, B. rapa cv. 'Aoi', and Trifolium pratense (red clover, non-cruciferous control).  Total bacterial counts on TSA increased regardless of the plant species or cultivar.  There were no clear correlation between the total amounts of glucosinolate (0.03-0.57 μmole/g tissue) in the residues and their inhibitory effects on the pathogen.  The results suggest that incorporation of specific plant residues change the composition of soil bacteria.

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