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Effect of DPX 3778 on Anther Dehiscence in Pearl Millet¹

DPX 3778 [3-(p-chlorophenyl)-6-methoxy-s-triazine-2, 4-(1H, 3H)-dione-triethanolamine] was tested on pearl millet (Pennisetum americanum (L.) Leeke) to investigate its potential for preventing anther dehiscence. DPX 3778 prevented both anther exsertion and dehiscence in pearl millet. Pollen remained stainable and plump. Growth stage of the plant when the chemical was applied was very important. A 7.43 kg/ha application at the mid to late boot stage on inbreds ‘Tift 23DB’, ‘Tift 239DB₂’, ‘Tift 13’, and ‘Tift 18DB’, followed by a second application at the same rate 5 to 6 days later, reduced selfed seed set to 2, 13, 5, and 30%, respectively. No female sterility or reduction in test weight of seed due to the chemical was observed. Application when plants were in the vegetative stage resulted in yellowing and loss of effectiveness at anthesis. A genotype response was observed among the four inbreds tested. DPX 3778 can be used effectively to produce hybrids in pearl millet.

Key Words: Male sterility • Pennisetum americanum • Gametocide • Hybrids

² Research geneticist, ARS, USDA, and the Univ. of Georgia, College of Agriculture Exp. Stns., Coastal Plain Station, Tifton, GA 31794.

Received for publication May 14, 1977.