Effect of Soil Amendments with Different Chemical Inducers on the Pathogenicity of Ralstonia solanacearum to Tomato and Potato Plants

摘要

Beta-amino butyric acid (P-ABA), salicylic acid (SA), calcium oxide (CaO) + urea play important roles in inducing and accumulating phytoalexins in plants. Soil amended with these inducers influenced the presence of Ralstonia solanacearum population density in the soil rhizosphere of both tomato (Lycopersicon esculentum cv. 'Pinto') and potato (Solanum tuberosum cv. 'Spunta') plants. This led to a reduction in the percentage of infection and disease severity compared to the control treatment. Different concentrations of beta-ABA and SA were effective in reducing the pathogenicity of R. solanacearum to tomato and potato plants as well as decreasing the population of bacteria invading their roots. Also, soil amended with CaO + urea influenced the presence of R. solanacearum population density in the soil rhizosphere of both tomato and potato plants.