الفهرس 
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Abstract
The present Study aimed to induce useful mutations and increase variability in marjoram population, as well as trial to micropropagation of marjoram. Seeds of Marjoram(Marjorana hortensis Moench) were irradiated at three Y-ray doses(50,100 and 150 GY). The effect of gamma ray dose for induction of genetic changes was decreasing with the increasing in the dose at M2 generation.