Abstract
The seeds of pure-breeding lines of wheat (S354 and K227) and rice (Jhona-349 and TN-1) and their F 1 hybrids were treated with different gamma ray exposures. A significant increase in variation was evident after exposure of pure-breeding and hybrid genotypes. The magnitude of the induced variation in the pure-breeding lines of wheat for grain number and grain yield was either equal to or greater than the conventional segregation following hybridization. For rice the two types of variations were almost the same for yield but the hybridization segregation was greater for plant height and tiller number. Variations from hybridization and irradiation were generally not cumulative.
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