Efecto de la Infeccion de Spongospora subterranea f. sp. subterranea en Hospederos Alternos / Effect of Spongospora subterranea f. sp. subterranea Infection on Alternate Hosts

• Published in: Revista Facultad Nacional de Agronomía, Medellín Medellín, 2014-07, Vol.67 (2), p.7261-7269
• Main Authors: Ivón Magaly Arcila Aristizábal, González Jaimes, Elena Paola, Catalina María Zuluaga Amaya, Marín Montoya, Mauricio Alejandro, José Miguel Cotes Torres
• Format: Article
• Language: eng ; spa
• Subjects: Crop rotation; Pathogens; Plant diseases; plantas trampa; Potatoes; rotación de cultivos / Powdery scab; Sarna polvosa; Soil microorganisms; Solanum tuberosum; trap crops
• ISSN: 0304-2847; 2248-7026
• DOI: 10.15446/rfnam.v67n2.44167

Trap crops have been considered an alternative strategy to reduce the inoculum of soil pathogens such as Spongospora subterranea f.sp. subterranea. In this work, the incidence of this pathogen was evaluated at three consecutive sowings using different alternative hosts. Plants were sown in pots containing 2 kg of soil inoculated with 1x105 cystosori per gram and harvested every three months. Roots were tested for the presence of cystosori and zoosporangia using light microscopy observations with trypan blue (0.05%) and Real-time PCR (qPCR). Data fitting was performed using Exponential and monomolecular models. According to the estimated incidence values of pathogen structures, plant species Cyphomandra betacea, Physalis peruvianum, Solanum nigrum, Allium cepa, Solanum quitoense and Rumex crispus, significantly reduced the amount of cystosori and zoosporangia after the three consecutive sowings. In contrast, Petroselinum crispum, Pennisetum clandestinum, Zea mays and Solanum lycopersicum increased the incidence of S. subterranea f. sp. subterranea.