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Published in Crop Sci 10:674-676 (1970)
© 1970 Crop Science Society of America
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Recurrent Selection in Maize for Earworm Resistance1

N. W. Widstrom, W. J. Wiser and L. F. Bauman2

Recurrent selection for resistance to corn earworm [Heliothis zea (Boddie)] injury in a population of maize (Zea mays L.) resulted in some progress during the first cycles of selection, but slowed considerably in later cycles. Progress of selection for specific combining ability in this population, derived from crosses among 34 inbred lines, seemed to plateau after approximately three or four generations of half-sib selection with a moderately resistant tester. Realized heritability was estimated at 16.6% during five cycles of selection. It is suggested that either a change in the method of measuring earworm injury in this experiment or several cycles of random mating among the selected populations might make further selection progress possible. The use of a more susceptible tester or S1 progeny testing per se is also suggested to assist in identification of the more resistant genotypes. It was demonstrated that a population can be developed with a relatively high degree of resistance, or with a relatively high concentration of genes for resistance to corn earworm injury, while at the same time desirable agronomic traits, such as yield, are maintained.

Key Words: Heliothis zea • Genetic response • Combining ability • Population improvement • Selection plateau

1 Contribution of the Crops Research Division, Agricultural Research Seivice, U.S. Department of Agriculture, Journal Series Paper No. 745, University of Georgia College of Agriculture Experiment Stations, Coastal Plain Station, Tifton.

2 Research Geneticist, Research Agronomist (now Beltsville, Md. 20705): and formerly Research Agronomist (now Professor of Agronomy, Purdue University, Agricultural Experiment Station, Department of Agronomy, Lafayette, Ind. 47907), respectively, Agricultural Research Service, U.S. Department of Agriculture, Tifton, Ga. 31794.

Received for publication April 10, 1970.




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