Screening of Potato Lines Including Department Genetic & National Plant Gene Bank of Iran for Resistance to Early Blight (<i>Alternaria. solani</i>) Using Culture Filtrate Produced by the Fungus

Abstract

Potato is a plant that can be influenced by early blight disease. Early blight is one of the most destructive plant diseases, especially in the members of solanaceae family. This disease can reduce yield. Experiment design was a factorial ran domized complete design to evaluat e the isolate pathogenic Alternaria solani in National Plant Gene Bank of Iran, dur ing 2008-2009. This experiment was conducted with three replications, and the f actors include test methods and three lines 9506, 10908-05 and 10908-18 with genotypes of Agria, Casmos and Desiree (susceptible) and Delta (resistant con trol). Analysis of variance table was based on the area under the disease progress curve, indicating the effects of the ex perimental methods; genotype and their interactions are significant at the 1% level. In greenhouse evaluation, the symptoms appeared on , the first day. In this method the area under the curve progression was note d in 10 times, but in vitro method, the symptoms of this evaluation appeared on the first or second day. The Evaluation was carried out after inoculation, and was noted 6 times. The results indicate that genotypes and lines are located in four different groups. In this case, line 9506 and Cosmos were quite sensitive to the surface, and Desiree, is located in a sensitive area. Line 10908- 18 and Agria, located approximately at the level of resistance, and line 10908-05 and Delta, have been resistant surface.