Potential resistance of certain sunflower cultivars and inbred lines against charcoal rot disease caused by Macrophomina phaseolina (Tassi) Goid

Abstract

In this study, fourteen sunflower cultivars and inbred lines (Giza 102, Sakha 53, Enosa, Bozoloke, L7, L16, L22, L26, L35, L36, L46, L49, L60 and L63) were evaluated for their resistance to charcoal rot disease. Obtained results indicated that, Giza 102 and Sakha 53 cultivars gave the lowest percentage of charcoal rot disease severity. While, inbred line L46 showed the highest percentage of charcoal rot disease severity. The highest amount of total phenol contents was found in infected plants of the most resistant sunflower cultivars Giza 102 and Sakha 53. While, the most susceptible line L46 showed the lowest amount of total phenol contents. Furthermore, the highest level of all determined enzymes activity Catalase, Peroxidase and polyphenoloxidase, were found in infected plants of the most resistant sunflower cultivars Giza 102 and Sakha 53. However, the lowest activity of enzymes was found in infected of the highest susceptible sunflower inbred line L46. The results of this study indicated that cultivated resistant cultivars are effective and economical method for controlling charcoal rot disease of sunflower.