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Performance of Inbred Lines in Hybrid Combination During the Transfer of a Single Gene ( ae ) Locus in Maize ( Zea mays L.)¹

The effects of the gene ae and possible linked factors were studied with regard to yield during the transfer of ae to the four inbreds of the double cross hybrid U.S. 13. The effects of the gene and its linkage block in the inbreds were studied in backcross test during three generations of backcrossing and selfing. The effects of the gene and its linkage block in hybrids were studied in single cross tests following various generations of back crossing to the four inbreds.

Expected lengths of linkage block segments around the ae locus held heterozygous for the different generations were calculated. From these the percent heterozygosity was calculated for ae and normal phenotypes. Observed and expected yields were compared with the t-test. The expected yield was calculated by equating the difference between the mean of the inbreds and the single cross to 100% heterozygosity. Expected yield was based on percent hetorozygosity.

The ae gene and not genes linked with it appeared to have a strong adverse effect on yield. Evidence from ae kernels and normal kernels from the same ear indicated that the effect of gene ae was on kernel size, supporting existing evidence that ae blocks the formation of branch chain polysaccharides without a corresponding increase in straight chain polysaccharides.

Key Words: amylose starch • corn • gene blocks • heterozygosity • linkage

² Formerly Graduate Research Assistant (now Plant Breeder, DeKalb Agricultural Association, Inc., Albany, Ga.), Professor of Agronomy, and Director of the Agricultural Experiment Station, Purdue University.

Received for publication January 21, 1967.