Environmental Effect and Acetylsalicilyc Acid on Agronomic Performance of Three Sweet Potato Genotypes

Abstract

The present research on the effect of chemical inducers of systemic acquired resistance in sweet potato (Ipomoea batatas Lam.), was developed during 2012-2013 at Cañete, Peru. The objective was to determine the effectiveness of some chemicals used for the induction of systemic acquired resistance on sweet potato agronomic performance in order to improve overall health in the fields, increase of plant survival and reduce the impact of agrochemical applications. 3 sweet potato genotypes were sown in RCBD with 3 replications during in the winter of 2012 and summer of 2013. Additionally two chemical inducers of SAR, potassium phosphite (2.5ml.L -1) and acetylsalicylic acid (100 mg.L -1) were applied plus untreated control plots. The results indicated that there were no statistical differences (p > 0.05) for root weight/plant and there were statistical differences in weight of foliage/plant for chemical treatments. Statistical differences were found between seasons and interaction of seasons and genotypes for foliage weight, suggesting a physiological effect by the application of inducing systemic resistance on the agronomic performance of sweet potato. It was concluded that specific effect of acetylsalicylic acid increased the weight of foliage/plant in genotypes of sweet potato and there were no influences for root yield. Faustino Sánchez Carrión. Av. Mercedes Indacochea 608, Huacho-Perú. Phone: 511-2322773. RESUMEN El presente trabajo de investigación sobre el efecto de inductores químicos de resistencia sistémica adquirida en el cultivo de camote (Ipomoea batatas Lam.), se desarrolló durante las campañas 2012-2013 en el valle de Cañete-Perú. The objective was to determine the effectiveness of some products for the induction of systemic acquired resistance in sweet potato agronomic performance in order to improve the overall condition of the fields, increase plant survival and reduce the impact of agrochemical applications. Se sembraron 3 genotipos de camote en un DBCA con 3 repeticiones durante dos campañas, una en invierno del 2012 y la segunda en el verano del 2013. Adicionalmente se aplicaron 2 inductores químicos de RSA, fosfito de potasio (2.5 ml.L -1) y ácido acetil-salicílico (100 mg L -1) más un testigo control sin aplicación.. Los resultados indican que no existieron diferencias estadísticas (p>0.05) entre los tratamientos para peso de raíces/planta pero si en el peso de follaje/planta; existieron diferencias estadísticas entre estaciones (épocas de siembra) y en la interacción de épocas y genotipos para peso de follaje, sugiriéndose un efecto fisiológico por la aplicación de los inductores de resistencia sistémica sobre el comportamiento agronómico del cultivo de camote. Se concluye que existió efecto específico del ácido acetil-salicílico y éste incrementó el peso de follaje en los genotipos de camote, pero no influenció el rendimiento de raíces.