Efectis de temperatura, humedad relativa y fisiología de bulbos de cebolla (Allium cepa) en la incidencia de Aspergillus Níger en el Valle inferior del Río Negro. Argentina

• Main Authors: Pozzo Ardizzi, María Cristina, Aschkar, Gabriela A., Pellejero, Graciela, Gil, María Inés
• Format: Article in Journal/Newspaper
• Language: Spanish
• Published: Universidad Nacional del Comahue: Centro Regional Zona Atlántica 2008
• Subjects: Postcosecha; Temperatura; Humedad relativa; Porcentaje de agua en los tejidos; Sólidos solubles; Cultivares; Post-harvest; Temperature; Relative humidity; Percentage of water in the tissues; Soluble solids; Cultivars; Argentina; Grano; Antarc*; Antarctica; Antártica
• Online Access: http://dialnet.unirioja.es/servlet/oaiart?codigo=3360585

Cultivated onion in the Low Valley of Río Negro is subjected to prolonged periods of conservation during which is very common that post-harvest diseases develop. Our object was to assess the effects of temperature (T) and relative humidity (HR) within the storage structures (batteries), and the water percentage (PA) and soluble solids (SS) of bulbs, on the incidence (I) of Aspergillus niger in different onion cultivars. Cobriza INTA, Antarctica INTA, Valcatorce INTA, Valuno INTA and Grano de Oro were the cultivars employed. Sensors to record T and HR were placed over and into batteries and periodic bulb samplings were taken out to assess I, PA and SS. The effects of the mentioned parameter over the pathogen behaviour were analyzed in each cultivar. The incidence increased in the first phase of conservation while the decreasing T promoted the pathogen sporulation. This phenomenon didn�t progress when these continued decreasing, and the detachment of the affected scales resulted in a disease decrease. The PA and SS analyze explained difference in the A. niger incidence between the white and the colored cultivars, but could not, differentiate the incidences among the last. It could be emphasize that Valuno INTA and Grano de Oro cultivars showed the best behavior in front to the disease, the optimal duration of the conservation period oscillated between the two and three and half months, and the need to reduce the inoculum in the productive environment. La cebolla cultivada en el Valle Inferior del Río Negro, Argentina, es sometida a prolongados períodos de conservación en los que frecuentemente desarrollan enfermedades de postcosecha. Nuestro objetivo fue evaluar los efectos de la temperatura (T) y la humedad relativa (HR) dentro de la estructura de almacenamiento (pilas), y del porcentaje de agua (PA) y sólidos solubles (SS) de los bulbos, sobre la incidencia (I) de Aspergillus niger, en diferentes cultivares de cebolla. Los cultivares que intervinieron fueron Cobriza INTA, Antártica INTA, Valcatorce INTA, ...