Inhibition of Bacterial Wilt of Tomato Caused by Ralstonia solanacearum by Sugars and Amino Acids

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  • Posas Marylene Bagarinao
    Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology
  • Toyota Koki
    Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology
  • Islam Tajul MD
    Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology

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Abstract

Different sugars and amino acids were added to a conducive soil to study their effects on bacterial wilt of tomato caused by Ralstonia solanacearum YU1Rif43. The compounds were selected mainly based on the utilization ability of the pathogen and added to the soil at application rates of 0.5 to 5 mg g-1, together with an inoculation of the pathogen. While tomato seeds germinated and grew healthy in soils amended with carbohydrates at a rate of 5 mg g-1, most of the seeds failed to germinate in soils to which serine, glycine and alanine were applied at the same rate. At 2.5 mg g-1, the inhibitory effect on tomato germination disappeared except for methionine. Most of the compounds decreased the incidence of wilt during 30 days of cultivation, while sucrose, fructose, threonine, acetate, and glycerol had no apparent suppressive effect. The compounds that showed the most suppressive effect were glucose, proline, glutamine, serine, arginine, and lysine. The pathogen utilized glucose, proline, and glutamine, but not serine, arginine and lysine. Certain compounds stimulated microbial activity and decreased the survival of the pathogen, and thereby suppressed bacterial wilt of tomato.<br>

Journal

  • Microbes and Environments

    Microbes and Environments 22 (3), 290-296, 2007

    Japanese Society of Microbial Ecology / Japanese Society of Soil Microbiology / Taiwan Society of Microbial Ecology / Japanese Society of Plant Microbe Interactions / Japanese Society for Extremophiles

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