شناسایی منابع مقاومت در ارقام سینتتیک هگزاپلویید و تجاری گندم نسبت به بیماری لکه‌برگی سپتوریایی

In order to identify sources of resistance to septoria tritici blotch (STB), seedling reaction of 116 synthetic hexaploid and commercial wheat cultivars to two isolates of the fungal pathogen Mycosphaerella graminicola was assessed based on percentage of pycnidial coverage at 21 dpi (days post inoculation). The results of combined analysis of variance showed that interaction between wheat genotypes and fungal isolates is significant at 1% level, indicating a specific interaction between cultivars and isolates. Mean comparison of reaction of wheat genotypes to isolates 90006 and 90007 showed that 25% cultivars including 22165, Sep B, Sep D, Sep-S1, Sep-S3 and Sep-S4 were immune to both isolates, whereas 37.93% cultivars including Hirmand, Bahar, Moghan3, Morvarid, Falat, Pishtaz, 22367, MV17 and Red Bob showed susceptibility to the isolates. Other cultivars displayed different levels of resistance or susceptibility. As majority of Iranian commercial wheat cultivars are susceptible to STB, the resistant genotypes, identified in this study could be utilized as resistance sources in wheat breeding programs in Iran.