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Changes in Six Different Opaque-2 Genotypes of Zea mays L. During Successive Generations of Backcrossing ¹

Changes during backcrossing of six inbred lines of Zea mays for grams lysine per 100 g of protein and seed weight reduction during conversion to opaque-2 were measured. Linear and quadratic regression coefficients were calculated for response of grams lysine per 100 protein. Although differences were found in the lines studied, the changes obtained were gradual and could not be attributed to interaction of the opaque-2 gene with one or a few genes from the recurrent parents. The changes were probably due to genetically controlled differences that occur in the protein fractions of the kernel with backcrossing. These changes may enhance or reduce the effects of the opaque-2 gene in different recurrent parent genotypes. The percent reduction in seed weight of opaque-2 plants did not differ statistically among inbred backgrounds nor generations of backcrossing.

Key Words: Lysine • Seed weight • Protein quality • Maize

² Graduate assistant (now Plant Breeder, Moews Seed Company, Granville, Illinois) and Associate Professor of Plant Genetics, Department of Agronomy, University of Illinois Urbana-Champaign, Urbana, Illinois 61801.

Received for publication April 2, 1970.