ارزیابی نمونه‌های ژنتیکی دیپلوید وحشی کلکسیون سیب‌زمینی بانک ژن گیاهی ملی ایران برای مقاومت به بیماری لکه موجی ناشی از Alternaria tenuissima وAlternaria solani در شرایط درون شیشه‌ای و گلخانه‌ای

Species of pathogenic fungi Alternaria SPP developed early blight disease on potato. In order to evaluate the resistance levels of wild diploid accessions of National Plant Gene bank of Iran, a factorial randomized complete design with three replications was performed in National Plant Gene Bank under in vitro and greenhouse condition during 2007-2008 and disease symptoms were recorded. Based on area at disease progress curve for each of two pathogenic fungi A. solani and A. tenuissima disease development on five diploid accessions i.e: TN 528, TN 530, TN 531, TN 532, TN 533 and Agria (susceptible chek) experiment has been designed. Analysis of variance result of in vitro and greenhouse evaluation indicated significant effects of pathogens, sample of genotypes and their interaction. In vitro evaluation, symptoms were observed the first and third days after inoculation via in vitro evaluation, in which, continued up to date sixth. By using A. solani accession TN 533 and accessions TN 531 and TN 530 were at lower and higher levels than Agria. Respectively, mean while, by causing A. tenuissima accession TN 528 and TN 533 and TN accessions TN 531 were at semilar and higher level than that of Agria. Disease symptoms during green house evaluation began on the third day and continued until the day twentieth. During this part accessions: TN 533, TN 532 and TN 530 were at the lower levels compare with Agria and accessions: TN 531 and TN 528 were at higher levels when A. solani has been used. When A. tenuissima was applied accession TN 528 was at semilar level and accession TN 533 was in higher level than Agria.