Seeds of cv. Restoler and Noor of sunflower (Helianthus annuusL.) were subjected to 0.5 to 50ensp;krad60Co gamma radiation (1ensp;radensp;=ensp;10ensp;mGy) and grown to maturity in a greenhouse. Two low dosages, i.e., 1ensp;krad in cv. Restoler and 3ensp;krad in cv. Noor, caused statistically significant stimulation of vegetative growth and seed yield (both total number and weight). For cv. Noor, 3ensp;krad also significantly stimulated the weight of an individual seed. Significant declines in the yield of mature seeds occurred only at critical dosages of ensp;10 to 20ensp;krad.
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