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Certain R alleles of maize were used to test for the presence of the floury-2 allele in putative double mutants opaque-2, floury-2. With the use of double pollinations a generation of testcrossing could be eliminated for floury-2. The results indicate the Rnj allele could be used to advantage in the genetic backgrounds tested.
Key Words: Double pollination
2 Associate Professor, Plant Genetics, University of Illinois, Urbana 61801, and Plant Breeder, Illinois Foundation Seeds, Inc., respectively.
Received for publication April 30, 1970.
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