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Published in Crop Sci 16:34-38 (1976)
© 1976 Crop Science Society of America
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Inheritance of High Lysine in Maize1

Bong-Ho Choe, M. S. Zubér, G. F. Krause and E. S. Hilderbrand2

Two maize (Zea mays L.) families with high and two with low lysine were selected from the first cycle of Zuber and Helm's recurrent selection experiment in Logan County Composite. Plants from these four families were selfed and crossed to opaque-2.

The level of lysine from the high and low families was transmitted to the testcross F1's and to both the normal and opaque phenotypes of the F2 populations. The results indicate that two genetic systems are involved in lysine synthesis, one associated with the opaque-2 gene per se and the second operating independently of opaque-2. Several of the opaque phenotypes from the F2's involving the high-lysine parents had more lysine than the opaque- 2 parents. The two genetic systems appeared to complement each other in an additive manner.

Although the selection criterion in the recurrent selection for high lysine was only lysine content on a whole kernel basis, the protein level for the'high-lysine families and their crosses was higher than that for the low-lysine families. Thus recurrent selection for high lysine resulted in higher levels of protein.

Key Words: Protein quality • Amino acid • Corn breeding • Recurrent selection

1 Cooperative investigations of the Dep. of Agronomy, Univ of Missouri Agric. Exp. Stn., Journal Series No. 7106, and the ARS-USDA. Part of a thesis submitted by Bong-Ho Choe in partial fulfillment of the requirements for a Ph.D. degree. This research was supported in part by a grant from the Quaker Oats Company.

2 Former graduate assistant, presently corn breeder, 111. Foundation Seeds, Champaign, III.; research leader, ARS-USDA, and professor of agronomy; statistician, Mo. Agric. Exp. Stn.; and statistician, Campus Computer Center, Columbia, Mo.

Received for publication April 19, 1975.




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