Abstract

Sclerotinia sclerotiorum (Lib.) de Bray, The causal agent of the stem rot disease, is prevalent and poorly
managed on oilseed rape in the north of Iran. The genetic variations among of isolates of S. sclerotiorum
collected from 29 fields in north of Iran was assessed, using morphological characteristics. Classification of the
isolates to mycelial compatibility groups (MCGs) is used as a quick marker for genotyping within S.s
populations. From forty-eight samples isolated from twenty-nine rapeseed fields, thirty-one MCGs were
identified, that the most of the isolates within a single MCG were identical; however, the isolates belonging to
the MCG4 were morphologically dissimilar. And also these isolates had different color (white, beige and grey)
on PDA medium after 21 days. The data suggested that there are high rates of out crossings as well as
evolutionary potentials found within the population. This is the first report of genotype variations between S.s
populations from rapeseed fields in Iran.

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