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Gamma Radiation Effects on Pearl Millet Pollen¹

Gamma irradiation of pollen from pearl millet [Pennisetum americanum (L.) K. Schum. (formerly P. phoides)] inbreds at doses of 0.2 to 16 kR indicated, based on seed set, that inbreds ‘Tift 23DB’ and ‘Tilt 186’ were significantly more sensitive to irradiation than inbred ‘Tift 239DB.’ Average seed set obtained by irradiating pollen of these inbreds was reduced about 50% at doses between 1.2 and 3 kR. No seed set was obtained when pollen was irradiated at 16 kR. Pollen irradiated at 3 kR produced the highest frequency (11%) of semisterile plants. Seed set on semisterile plants (generally 20 to 60%) was adequate to make the translocations useful cytological stocks.

Key Words: Pennisetum americanum • Pennisetum typhoides • Chromosomal interchanges • Cytoplasmic male sterility • Nonrestorer

² Research Geneticist and Research Entomologist, ARS-USDA and the University of Georgia. College of Agriculture Experiment Stations, Coastal Plain Station, Tifton, Ga. This work was supported in part by the U.S. Atomic Energy Commission Contract No. AT (38-1)-637.

Received for publication February 23, 1974.