Abstract
Plants (gamma-1) from three cultivars each of wheat (Yecora, Pari and Chenab-70) and sorghum (Pq.7.dwarf, Ks.12.medium dwarf and Ts.100.tall) were irradiated (wheat: 0.5–7 kR; sorghum: 1–10 kR) at three developmental stages (1-leaf, ear emergence and anthesis). Seeds borne by gamma-1 plants (gamma-2 seeds) were collected from three developmental stages and raised as gamma-2 plants in the subsequent year. In general, germinability and grain yield of gamma-2 seeds decreased the later the gamma-1 plants were irradiated in the life cycle. The yield of gamma-2 plants was most reduced when gamma-1 plants were irradiated at the anthesis stage. Yield of gamma-2 plants was least affected when gamma-1 plants were irradiated at the 1-leaf stage of irradiation. Significant increases in yields were observed at certain exposures in wheat (0.5 kR) and sorghum (2–3 kR in dwarf and medium dwarf cultivars, and at 1–3 kR in the tall cultivar).
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