الفهرس 
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Abstract
The experiment was carried out during 2006, 2007 and2008 in the floriculture and ornamental horticulture research branch, antoniades garden, alexandria, egypt. The investigations were conducted to study empirically the effect of different gamma- rays doses, from co-60 source on the M1 and M2 generation of encelia farinosa produced from irradiated dry seeds.